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根据１９７９年６月公布实施的日本手表出口标准，机械摆轮式手表，按表机直径分为大于２０ｍｍ的表，即普通男表（包括自动男表），以及表机直径小于２０ｍｍ的表，即普通女表（包括自动女表）。 男表日差为－３０～＋９０ｓ／ｄ，位差不超过９０ｓ。 女表日差为－３０～＋１
According to the Japanese wristwatch export standard promulgated in June 1979, the mechanical wristwatch is divided into tables larger than 20 mm according to the diameter of the watch, that is, the ordinary male watch (including the automatic male watch) and the watch whose diameter is less than 20 mm, The ordinary female form (including automatic female form). Male table as -30 ~ + 90s / d, the difference does not exceed 90s. Female table as -30 ~ + 1