Meanwhile, there’s some evidence that international distributors hated the inconsistent and infrequently illogical numbering units in their Swiss overlords. 100M Water-resistant: By using a drinking water resistance of as many as 100M you can easily handle most cases in life, such as washing arms, rain, swimming(please tighten the crown when https://www.watchesworld.com/a-history-of-watch-reference-numbers/