What are the little knowledge of clocks and watches?

1. Little knowledge of clocks and watches.

Watch tips 1. Clock knowledge

[Edit this paragraph] Overview of clocks and watches.

Clock and watch are both precise instruments for measuring and indicating time. Clocks are usually distinguished by the size of the internal machine.

According to international practice, clocks and watches with movement diameter greater than 50 mm and thickness greater than 12 mm; A pocket watch with a diameter of 37~50 mm and a thickness of 4~6 mm is called a pocket watch; Watches with a diameter less than 37 mm; A watch whose diameter does not exceed 20mm or whose movement area does not exceed 3 14m2 is called a women's watch. The watch is one of the smallest, strongest and most sophisticated machines invented by human beings.

The power of modern clocks and watches includes mechanical force and electricity. Mechanical clock is a kind of timer which uses the energy released by heavy hammer or spring as power to drive a series of gears to run, adjusts the speed of gear train with the help of escape governor, and indicates time and metering time with hands. Electronic clock is a kind of timer which is powered by electric energy, and liquid crystal displays numbers and timely hands.

[Edit this paragraph] In the history of clocks and watches, primitive people judged time by the change of sky color and the brightness of the sun. Ancient Egypt discovered that the shadow length would change with time and invented the sundial to measure time in the morning. They also found that the time needed for water to flow was fixed, so they invented the water clock.

In ancient China, people also used water to time-dripping water from a copper pot, and burning incense to time. Put the incense horizontally and put a rope with steel balls on it, which can tell the time.

1283, the first mechanical clock driven by weight appeared in English monasteries. Monks in northern Italy began to build bell towers (or bell towers) in the third century A.D./Kloc-to remind people of the time of prayer.

/kloc-in the middle of the 0/6th century, Germany began to have clocks on the table. Those clocks have only one hand, and the clock face is divided into four parts, which makes the time accurate to the nearest 15 minutes.

1657, huygens discovered that the frequency of pendulum can calculate time, and made the first pendulum clock. 1670, an Englishman William Clement invented the anchor escapement.

1797, Eli Terry, an American, obtained the patent right of clocks and watches. He is regarded as the originator of American watch industry.

[Edit this paragraph] The development of clocks and watches 1300 years ago, human beings mainly used the continuous movement of time by astronomical phenomena and mobile substances. For example, the sundial is timed according to the orientation of the sun's shadow; When clepsydra and hourglass are flow meters that use water and sand.

In the Eastern Han Dynasty, Zhang Heng made a leak-turning armillary sphere, and connected the elephant with a timed leak kettle by a gear system. The leaky kettle drips water to push the elephant to rotate evenly, once a day. This is the earliest mechanical clock. Su Ge and Han Honglian, etc. In the third year of the Northern Song Dynasty (1088), the water transport instrument platform was created and the escapement mechanism was used.

1350, Danti, an Italian, made the first mechanical clock with simple structure, with a daily difference of 15~30 minutes, and the indicating mechanism was only an hour hand; 1500~ 15 10, Henleith of Germany first replaced the heavy hammer with a steel spring and created a small mechanical clock with a crown wheel escapement mechanism. 1582 or so, Galileo of Italy invented the gravity pendulum; 1657, huygens of the Netherlands introduced the gravity pendulum into the mechanical clock and founded the pendulum clock. 1660, Hook of England invented the hairspring, and replaced the crown wheel escapement with the backward escapement. 1673, Huygens applied the governor composed of hairspring to portable clocks and watches; 1675, Clemente of England made the simplest anchor escapement with fork-hoof device, which has been used for single pendulum wall clocks.

1695, Tom ping of Britain invented the I-wheel escapement; 17 15, Graham of England invented the static escapement, which made up for the deficiency of the backward escapement and laid the foundation for the development of precision mechanical clocks and watches. 1765, March of England invented the free anchor escapement, which is the predecessor of modern fork-hoofed escapement. From 1728 to 1759, Harrison in Britain made high-precision standard navigation clocks; From 1775 to 1780, Arnold of England created the escapement mechanism of precision watches. From 18 to 19 century, the watch manufacturing industry gradually realized industrial production and reached a fairly high level.

In the 20th century, with the rapid development of electronic industry, battery-driven clocks, AC clocks, electromechanical watches, analog electronic clocks and digital electronic clocks came out one after another, and the daily difference of clocks was less than 0.5 seconds. Clocks and watches have entered a new era of combining microelectronics technology with precision machinery [edit this paragraph]. The evolution of clocks and watches can be roughly divided into three stages, namely: 1. From big clock to small clock. Second, the transition from small clock to pocket watch.

Third, the development from pocket watch to wrist watch. The development of each stage is inseparable from the technological invention at that time.

1088, Su Song and Han Gonglian, scientists of the Song Dynasty, made the portrait platform of the water transport instrument, which is a device that combines the armillary sphere, the elephant and the mechanical timer. It is driven by hydraulic power and has a scientific escapement mechanism. It is about 12 meters high and 7 meters square, and is divided into three layers: the upper layer is equipped with an armillary sphere for astronomical observation; The middle layer can simulate celestial bodies for synchronous demonstration; The lower layer is the heart of the instrument, and the formation and output of timing, time telling, power supply are all on this layer.

Although it was destroyed by war decades later, it is of great significance in the history of world watches. Therefore, Mr. Jiao Da Yu, a famous master of clocks and watches in China and a collector of ancient clocks and watches, put forward the viewpoint that "China people created the history of clocks and watches".

/kloc-in the 0/4th century, clocks appeared in the tall buildings of European countries such as Britain and France. The power of the clock comes from hanging a heavy hammer with a rope and using gravity to generate gravity. At the end of 15 and the beginning of 16, iron clockwork appeared, which gave clocks a new power source and created conditions for their miniaturization.

1583, Italian Galileo established the famous isochronism theory, which is the theoretical basis of pendulum. 1656, Dutch scientist huygens applied Galileo's theory to design the pendulum. The next year, under his guidance, the young watchmaker S.Coster successfully made the first pendulum.

1675, he replaced the original pendulum with a hairspring, thus forming a small clock with clockwork as the power and hairspring as the speed regulating mechanism, which also provided conditions for manufacturing portable pocket watches. /kloc-during the 0/8th century, various escapement mechanisms were invented, which laid the foundation for the further emergence and development of pocket watches.

George Graham, an Englishman, perfected the I-wheel escapement in 1726, which is different from the vertical shaft escapement invented before, so the movement of pocket watch is relatively thin. In addition, the British are around 1757.

2. Basic knowledge of watches

Watches, also known as watches.

That is, a tool worn on your wrist to time. In social situations, wearing a watch usually means a strong sense of time and rigorous style; People who don't wear watches, or people who often ask others the time, are always ridiculed, because this shows that their concept of time is not strong.

In formal social occasions, watches are often regarded as jewelry, especially for men who only have one ring to wear. Some people even emphasized: "Watches are not only men's jewelry, but also men's most important jewelry."

In western countries, watches, pens and lighters have been called the "three treasures" of adult men, and every man can't live without them all the time. Like jewelry, the watches people wear in social situations often reflect their status, identity and wealth.

Therefore, watches worn by people in interpersonal communication, especially watches worn by men, are mostly eye-catching. If you want to wear a watch correctly, you must first understand the watch and be good at choosing it.

When choosing a watch, we should always pay attention to its type, shape, color, pattern and function. (1) categories According to different standards, watches can be divided into many different categories.

In social situations, people generally distinguish their categories according to their prices. According to this standard, watches can be divided into four categories: luxury watches, high-end watches, mid-range watches and low-end watches.

Judging from the current price, the price of luxury watches is more than 10000 yuan. Is it high? Rice is between 2000~ 10000 yuan, middle-grade rice is between 500~2000 yuan, and low-grade rice is below 500 yuan. When choosing a specific type of watch, you should first do what you can, and don't do anything beyond your ability.

In addition, we should also consider a series of related factors such as personal occupation, appearance occasion, communication object and the clothes we choose at the same time. (2) The appearance of a watch is often related to its value and grade.

Watches worn on formal occasions should be solemn and conservative, and should not be unfamiliar or fashionable. Men, especially venerable people and the elderly, should pay more attention.

Novel and chic watches are only suitable for girls and children. Generally speaking, round, oval, square, rectangular and diamond watches are widely used, especially for formal occasions.

(3) Color selection For watches worn on formal occasions, the color stress circle is complicated and messy. Generally, you should choose monochrome watches and two-color watches, and don't choose three-color or more watches. Whether it is a monochrome watch or a two-color watch, its color should be clear, noble and elegant.

Gold watch, silver watch and black watch, that is, watches with gold, silver and black dial, case and strap, are the most ideal choices. Watches with golden case, strap and milky white dial can stand the test of time and will not be out of date in any era.

(4) Except numbers, trademarks, factory names and brands, there is no need for other patterns that have no influence on the watch. It is especially important to keep this in mind when choosing a watch on formal occasions.

If the patterns on the watch are strange and varied, it is not only not conducive to use, but may make people laugh. (5) Functional timekeeping is the most important function of a watch.

Therefore, watches used in formal occasions, whether they are pointer-type, word-skipping or time-telling, should have this function, and they should be accurate to time and minutes, preferably to seconds. Only the watches that were allowed at that time obviously did not meet the requirements.

Some additional functions, such as temperature, humidity, wind speed, direction, blood pressure, pace, etc. , are dispensable, it is better to do nothing. In a word, the functions of watches should be few and precise, and they should be of practical value.

Tell me something about clocks.

Clocks and watches: the general term for clocks and watches.

Clock and watch are both precise instruments for measuring and indicating time. Clocks are usually distinguished by the size of the internal machine.

According to international practice, clocks and watches with movement diameter greater than 50 mm and thickness greater than 12 mm; A pocket watch with a diameter of 37~50 mm and a thickness of 4~6 mm is called a pocket watch; Watches with a diameter less than 37 mm; A watch whose diameter does not exceed 20mm or whose movement area does not exceed 3 14m2 is called a women's watch. The watch is one of the smallest, strongest and most sophisticated machines invented by human beings.

The power of modern clocks and watches includes mechanical force and electricity. Mechanical clock is a kind of timer which uses the energy released by heavy hammer or spring as power to drive a series of gears to run, adjusts the speed of gear train with the help of escape governor, and indicates time and metering time with hands.

The development of clocks and watches 1300 years ago, human beings mainly used the continuous movement of time by astronomical phenomena and mobile substances. For example, the sundial is timed according to the orientation of the sun's shadow; When clepsydra and hourglass are flow meters that use water and sand.

In the Eastern Han Dynasty, Zhang Heng made a leak-turning armillary sphere, and connected the elephant with a timed leak kettle by a gear system. The leaky kettle drips water to push the elephant to rotate evenly, once a day. This is the earliest mechanical clock. Su Ge and Han Honglian, etc. In the third year of the Northern Song Dynasty (1088), the water transport instrument platform was created and the escapement mechanism was used.

1350, Danti, an Italian, made the first mechanical clock with simple structure, with a daily difference of 15~30 minutes, and the indicating mechanism was only an hour hand; 1500~ 15 10, Henleith of Germany first replaced the heavy hammer with a steel spring and created a small mechanical clock with a crown wheel escapement mechanism. 1582 or so, Galileo of Italy invented the gravity pendulum; 1657, huygens of the Netherlands introduced the gravity pendulum into the mechanical clock and founded the pendulum clock. 1660, Hook of England invented the hairspring, and replaced the crown wheel escapement with the backward escapement. 1673, Huygens applied the governor composed of hairspring to portable clocks and watches; 1675, Clemente of England made the simplest anchor escapement with fork-hoof device, which has been used for single pendulum wall clocks.

1695, Tom ping of Britain invented the I-wheel escapement; 17 15, Graham of England invented the static escapement, which made up for the deficiency of the backward escapement and laid the foundation for the development of precision mechanical clocks and watches. 1765, March of England invented the free anchor escapement, which is the predecessor of modern fork-hoofed escapement. From 1728 to 1759, Harrison in Britain made high-precision standard navigation clocks; From 1775 to 1780, Arnold of England created the escapement mechanism of precision watches. From 18 to 19 century, the watch manufacturing industry gradually realized industrial production and reached a fairly high level.

In the 20th century, with the rapid development of electronic industry, battery-driven clocks, AC clocks, electromechanical watches, pointer-type timely electronic books, thirst-quenching leeks, blood-activating bath clocks and digital timely electronic clocks came out one after another. The daily difference of clocks and watches has been less than 0.5 seconds, and clocks and watches have entered a new era of combining microelectronics technology with precision machinery. Clocks and watches have a wide range of applications and many varieties, which can be classified according to vibration principle, structure and application characteristics.

According to the principle of vibration, it can be divided into clocks and watches that use low-frequency mechanical vibration, such as pendulum clocks and balance clocks. Clocks and watches that use high-frequency electromagnetic oscillation and synchronous oscillation, such as synchronous clocks and synchronous clocks; According to the structural characteristics, it can be divided into mechanical watches, such as mechanical alarm clock, automatic, calendar, double calendar, clockwork, etc. Electromechanical, such as electric pendulum clock, electric balance wheel clock, etc. ; Electronic clock, such as balance wheel electronic clock, tuning fork electronic clock, pointer and digital display time electronic clock, etc. There are many structural forms of mechanical clocks and watches, but their working principles are basically the same. They are all composed of prime mover system, transmission system, escapement governor, pointer system and winding system.

Mechanical clocks and watches take clockwork as the power system, and drive the escape governor through a transmission system composed of a group of gears; Then the speed of the transmission system is controlled by the escape governor in turn; The transmission system drives the pointer mechanism while pushing the escapement mechanism, and the rotation speed of the transmission system is controlled by the escapement mechanism, so the pointer can indicate the time on the dial according to certain rules; The winding pointer system is a mechanism for winding springs or moving pointers. In addition, there are some additional mechanisms that can increase the functions of clocks and watches, such as automatic winding mechanism, calendar (double calendar) mechanism, alarm device, moon phase indication and timing mechanism.

The prime mover is a mechanism for storing and transmitting working energy, which usually consists of a box wheel, a box cover, a lever shaft, a spring and a spring hook. When the spring is in a free state, it is a spiral or S-shaped spring with a small hole at its inner end, which is sleeved on the hook of the rod shaft.

Its outer end is hooked on the inner wall of the box wheel through the clockwork outer hook. When winding, the winding needle system rotates the winding shaft and tightly winds the spring on the winding shaft.

The elastic action of the spring makes the box wheel rotate, thus driving the transmission system. The transmission system is a set of transmission gears, which transfer the energy of the prime mover to the escapement governor. It consists of two wheels (central wheel), three wheels (passing wheel), four wheels (second wheel) and the pinion shaft of the escape wheel, wherein the blade is the driving gear and the pinion shaft is the driven gear.

The tooth profile of clock transmission system is mostly modified cycloidal tooth profile based on theoretical cycloidal principle. The escapement governor consists of escapement mechanism and vibration system. It relies on the periodic vibration of the vibration system to keep the escapement mechanism in accurate and regular intermittent motion, thus realizing speed regulation.

Fork-shoe escapement is the most widely used escapement. It consists of an escape wheel, an escape fork, a double disc and a limit nail.

Its function is to transfer the energy of the power system to the vibration system, so as to maintain the constant amplitude vibration of the vibration system and transfer the vibration times of the vibration system to the indicating mechanism, thus achieving the purpose of timing. The vibration system is mainly composed of balance wheel, swing shaft, hairspring, movable outer pile ring, fast and slow needle, etc.

The inner and outer ends of the hairspring are respectively fixed on the swinging shaft and the swinging splint; When the balance wheel deviates from the balance position by external force and begins to swing, the hairspring is twisted to produce potential energy, which is called recovery moment. The escapement mechanism completes the above two actions, and the vibration system swings in the opposite direction under the action of hairspring potential energy to complete the other half of the vibration period, which is the principle that the escapement governor works continuously and repeatedly when the mechanical clock is running.

Function of needle winding system.

4.

As we know, the hour hand and the minute hand pass through 12 or 60 squares, each with 6O and each with 30 o. So the hour hand goes 30O per hour, 0.5O per minute; The minute hand walks 360 degrees per hour and 60 degrees per minute. In the same period of time, the angle of clockwise rotation is the angle of minute hand rotation. Let's talk about some math problems related to clocks. First find the angle formed by the hour hand and the minute hand at a certain moment. Example 1 What is the angle formed by the hour hand and the minute hand at 5 o'clock sharp? At 5 o'clock sharp, the hour hand and the minute hand are separated by 5 squares, so the included angle between the hour hand and the minute hand is 30O*5= 150O. What is the angle between the hour hand and the minute hand at 6: 40? At 6: 40, the hour hand and the minute hand are separated by (2) squares, so the included angle between the hour hand and the minute hand is 30O*(2)=40O. Second, find the period in which the hour hand and the minute hand overlap to form a right angle. Example 2 The hour hand and the minute hand are perpendicular to each other, coincident and at right angles. What time is it exactly on the hour? The hour hand and the minute hand are just perpendicular to each other, and the time is exactly 3 o'clock, 9 o'clock, 15 o'clock, 2 1 point. The hour hand and the minute hand coincide, and the time is exactly 0 o'clock, 12 o'clock, 24 o'clock. The hour hand and the minute hand are just at right angles, and the time is exactly 6 o'clock. Analysis: First, explore the period when the hour hand and the minute hand are perpendicular to each other. At 3 o'clock, the hour hand and the minute hand are perpendicular to each other. Let the minute hand pass through the minute hand from 3 o'clock, and then make a right angle with the hour hand. Judging from the meaning of the question, the period when the instant hand and the minute hand are perpendicular to each other is minutes. 24*60÷ = 44. Therefore, 24 hours a day, the hour hand and the minute hand are perpendicular to each other 44 times. Inquiry analysis: first, explore the time period when the hour hand and the minute hand overlap each other. 12, the hour hand and the minute hand overlap each other. Let the minute hand overlap the hour hand again after a few minutes from 12. The meaning of the question is: 24 * 60÷22. Therefore, the hour hand and the minute hand overlap each other 22 times in a 24-hour day. Inquiry analysis: first explore the period when the hour hand and the minute hand are at right angles. At 6 o'clock sharp, the hour hand and the minute hand are at right angles to each other. Let the minute hand start at 6 o'clock sharp, and the hour hand will be at right angles to the minute hand again after a few minutes. From the meaning of the title, it is 6 = 6*+30*6+30*6.

5. Basic knowledge of watches

Watches, also known as watches.

That is, a tool worn on your wrist to time. In social situations, wearing a watch usually means a strong sense of time and rigorous style; People who don't wear watches, or people who often ask others the time, are always ridiculed, because this shows that their concept of time is not strong.

In formal social occasions, watches are often regarded as jewelry, especially for men who only have one ring to wear. Some people even emphasized: "Watches are not only men's jewelry, but also men's most important jewelry."

In western countries, watches, pens and lighters have been called the "three treasures" of adult men, and every man can't live without them all the time. Like jewelry, the watches people wear in social situations often reflect their status, identity and wealth.

Therefore, watches worn by people in interpersonal communication, especially watches worn by men, are mostly eye-catching. If you want to wear a watch correctly, you must first understand the watch and be good at choosing it.

When choosing a watch, we should always pay attention to its type, shape, color, pattern and function. (1) categories According to different standards, watches can be divided into many different categories.

In social situations, people generally distinguish their categories according to their prices. According to this standard, watches can be divided into four categories: luxury watches, high-end watches, mid-range watches and low-end watches.

Judging from the current price, the price of luxury watches is more than 10000 yuan. Is it high? Rice is between 2000~ 10000 yuan, middle-grade rice is between 500~2000 yuan, and low-grade rice is below 500 yuan. When choosing a specific type of watch, you should first do what you can, and don't do anything beyond your ability.

In addition, we should also consider a series of related factors such as personal occupation, appearance occasion, communication object and the clothes we choose at the same time. (2) The appearance of a watch is often related to its value and grade.

Watches worn on formal occasions should be solemn and conservative, and should not be unfamiliar or fashionable. Men, especially venerable people and the elderly, should pay more attention.

Novel and chic watches are only suitable for girls and children. Generally speaking, round, oval, square, rectangular and diamond watches are widely used, especially for formal occasions.

(3) Color selection For watches worn on formal occasions, the color stress circle is complicated and messy. Generally, you should choose monochrome watches and two-color watches, and don't choose three-color or more watches. Whether it is a monochrome watch or a two-color watch, its color should be clear, noble and elegant.

Gold watch, silver watch and black watch, that is, watches with gold, silver and black dial, case and strap, are the most ideal choices. Watches with golden case, strap and milky white dial can stand the test of time and will not be out of date in any era.

(4) Except numbers, trademarks, factory names and brands, there is no need for other patterns that have no influence on the watch. It is especially important to keep this in mind when choosing a watch on formal occasions.

If the patterns on the watch are strange and varied, it is not only not conducive to use, but may make people laugh. (5) Functional timekeeping is the most important function of a watch.

Therefore, watches used in formal occasions, whether they are pointer-type, word-skipping or time-telling, should have this function, and they should be accurate to time and minutes, preferably to seconds. Only the watches that were allowed at that time obviously did not meet the requirements.

Some additional functions, such as temperature, humidity, wind speed, direction, blood pressure, pace, etc. , are dispensable, it is better to do nothing. In a word, the functions of watches should be few and precise, and they should be of practical value.

6. Watch knowledge

A watch is a precise timekeeping instrument, which is expensive and has a long service life.

The quality of watches is a matter of great concern to users. Therefore, when people buy watches, they always strive for perfection and choose the best among the good.

But how can we choose a watch with satisfactory quality? Under normal circumstances, it is unscientific for people to judge the quality of watches only by the volume and level of sound when listening to watch machines. Because the quality of a watch mainly depends on the accuracy of its actual time.

The balanced, clear and noiseless sound when the watch machine leaves can only show that the watch machine is not faulty, but not the quality of the watch, which is the only way to choose a watch. You must also choose from the following aspects: check the appearance of the watch. The appearance of a watch can be checked from the aspects of shell, mirror, dial, minute hand and second hand.

The case should be free of sand holes and obvious scratches, and the edges and corners should be symmetrical; The screw connection between the back cover and the upper shell should be tight; The distance between the two bezel and the case is equal, and the hole for installing earrings should be centered on the tail of the case, and the depth of the hole should be appropriate, so that the bezel is not easy to fall off; The mirror should be free of defects and scratches, transparent and bright; The three pins are installed correctly, and there should be correct safety gaps between the pins and between the mirror and the dial; Dial and pointer plating finish is good, no spots, dial scale or luminous point is complete; There is a gap of about 0. 1-0.3mm between the handle and the case. Check the sensitivity of the watch. The sensitivity of a watch refers to the flexibility of its balance wheel to swing automatically.

The inspection method is: 1) Shake the watch that is not wound slightly and stop moving, and observe the movement of the second hand with the help of the shaking force: if the second hand stops moving in a short time, it means that the watch can walk completely after it is completely wound (that is, the wind has no torque) with high sensitivity; If the second hand keeps going for a long time, it means that the watch can't go all the way after winding (that is, the spring still stores torque), the sensitivity is not high or the watch machine is faulty. 2) For a watch that is not wound or stopped, slowly turn the handle to observe the start of the second hand: the less the handle turns, the earlier the second hand starts, which means the higher the sensitivity of the watch; On the contrary, the sensitivity is low or the instrument has other faults.

However, it should be noted that, due to the greater stiffness of the hairspring, a fast-swinging watch needs a little more wind-up to swing than a watch with a traditional frequency (18000 times/hour). A watch with high sensitivity can go on for a long time after the last winding.

Check the spacing and position of the hands. There should be a certain distance between the pointer and the mirror, the dial and the three hands, otherwise they will collide with each other and affect the normal operation of the watch machine. When checking, you can observe it by pulling the needle.

Check whether the position and mutual cooperation of the hour hand and the minute hand are normal: set the minute hand and the hour hand at 3 o'clock and 9 o'clock, and observe whether the two hands are at right angles; Dial to 6 o'clock, whether the two needles are in a straight line; Dial to 12, whether the two stitches coincide. It should be easy to check the winding mechanism of a watch.

When winding the handle, it feels very loose at first, and gradually it becomes tighter and tighter. When the handle can't rotate forward, it means that the spring is fully loaded and the winding mechanism works normally. Is there a "chirp" sound when turning the handle? Abnormal noise or sliding of the top teeth indicate that the winding mechanism is faulty.

Check the needle setting mechanism of the watch. Watch should be flexible and reliable when setting hands, and the hands should rotate evenly. During inspection, the tightness of friction fit between the auxiliary wheel and the central shaft should be mainly checked.

When setting the needle, if there is no feeling of looseness or tightness, it means that the wheel friction is normal and the oil quantity is appropriate. On the contrary, the needle fixing mechanism is faulty. The above method of purchasing new watches can also be used as a reference for quality inspection of old watches or maintenance watches, but the standard should be lowered according to the service life of watches.

How to choose imported watches: the watches sold in major shopping malls are mainly Swiss and Japanese brands, and the counterfeit watches made in Switzerland and Japan are mostly concentrated in the following brands: Japanese brands: Oriental, Citizen, Seiko, Casio, etc. Swiss brands: Rolex, Tudor, Earl, Omega, Plum Blossom, Ibero, Longines, Ingrid, Celebrity, Simma, Omar, Rome, Tile Hour Hand, Radar, Tissot, etc. Appearance and movement recognition From the appearance, the trademarks and brand handwriting marked on the dial and back cover of genuine watches are clear and complete; The number of drills marked on the dial is consistent with the actual number of drills of the movement; The material marked on the back cover is consistent with the material used in the case; Watch glass is bright and clear; The outer edges and corners of the case assembly have no sharp feeling; The coating has no bubbles and does not fall off.

The trademarks and brands marked on the dial and back cover of counterfeit genuine watches are difficult to identify; The number of drills marked on the dial is inconsistent with the actual number of drills of the movement; The outer edges and corners of the shell assembly are rough, and the coating bubbles, falls off or the accessories are damaged. From the movement point of view, the splint or thallium in the genuine watch movement is marked with the corresponding trademark card; The motion is stable in the shell assembly; Clean the inside of the movement.

There is no trademark logo on the splint or thallium of the counterfeit watch movement, or the trademark logo is rough, fuzzy, skewed, or simply pasted with small copper sheets; The movement is not clean, and some movements contain copper chips, hair, fingerprints and so on. Determination of selling price The price of imported watches is stable for a certain period of time.

For example, Japanese brand watches cost 2500-3000 yuan; Swiss brand watches, the price is more than 1000 yuan, and some brand-name watches are as high as tens of thousands or even hundreds of thousands of yuan, such as Rolex, Tudor, Omega, Earl and so on. Generally speaking, for imported watches below the above price, if there is no special reason, it is suspected that they are counterfeit imported watches or watches of improper origin.

Identification of inspection marks When buying imported watches, consumers should check the seller's commodity inspection certificate and whether the number on the laser imitation mark is within the number range listed in the certificate. There are many other methods to identify authenticity, such as using detection instruments to detect gold content, travel time accuracy, waterproof performance, watch glass hardness, true and false diamonds and so on.

Through the measured data to verify whether it is consistent with the data and instructions marked on imported watches, and judge the authenticity. In addition, some famous watches have special identification methods because of their movement structure and inherent special memory, but they need professional equipment and instruments for inspection.

Finally, I wish you a satisfactory watch.