In the meantime, there’s some proof that international distributors hated the inconsistent and infrequently illogical numbering units in their Swiss overlords. 100M Watertight: With a water resistance of as many as 100M you can certainly manage most scenarios in everyday life, such as washing fingers, rain, swimming(please tighten the crown https://www.watchesworld.com/a-history-of-watch-reference-numbers/