Our most nostalgic types are boldly reimagined with modern-day features and common nods to our history of firsts. 100M Water-resistant: With a water resistance of nearly 100M you can certainly manage most cases in life, like washing arms, rain, swimming(remember to tighten the crown when heading in the h2o). The https://www.watchesworld.com/a-history-of-watch-reference-numbers/