This is one of the later models of the M1002, which is considered to be the first model of Big John. Since the flasher says "WORLD WORKERS", the fabric is already made in Japan. It was probably manufactured around 1975 when the transition took place. The M1002 was different from the early M1002 in that it had a bigger claim to be made in Japan and It is different in that it has been one-washed. In addition, the brand name of "BIG JOHN" is included in many parts, and the Big John brand is It can be seen that it was well-established.
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