In the meantime, there’s some proof that Intercontinental distributors hated the inconsistent and sometimes illogical numbering systems in their Swiss overlords. 100M Water-resistant: With a water resistance of approximately 100M you can easily take care of most situations in life, which include washing hands, rain, swimming(remember to tighten the crown https://www.watchesworld.com/a-history-of-watch-reference-numbers/