“Every single brand tried to have logic of their numbering system but unsuccessful miserably,” Mandelbaum continued. “It just represents the total absurdity of the Swiss endeavoring to think of a numbering program. 100M Water-proof: With a h2o resistance of around 100M you can easily cope with most predicaments in life, https://www.watchesworld.com/a-history-of-watch-reference-numbers/