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What does the red label on Levi's tag mean?

Small red cloth series

LEVI'S started sewing a small red label with LEVI'S (big E) on both sides in the right back pocket from 1936 to guard against fakes. 1969, Levi's began to convert Levi's red Tab into Levi's, 197 1 year, and all red tabs were converted into Levi's. Therefore, two kinds of red labels, big E and small E, were produced in this period.