Meanwhile, there’s some proof that Global distributors hated the inconsistent and often illogical numbering methods of their Swiss overlords. 100M Waterproof: By using a h2o resistance of around 100M you can easily take care of most predicaments in life, including washing fingers, rain, swimming(be sure to tighten the crown when https://www.watchesworld.com/a-history-of-watch-reference-numbers/