Meanwhile, there’s some proof that Global distributors hated the inconsistent and often illogical numbering systems in their Swiss overlords. 100M Watertight: By using a h2o resistance of as much as 100M you can easily tackle most scenarios in everyday life, including washing palms, rain, swimming(be sure to tighten the crown https://www.watchesworld.com/a-history-of-watch-reference-numbers/