“Every manufacturer attempted to have logic inside their numbering method but unsuccessful miserably,” Mandelbaum continued. “It just represents the overall absurdity on the Swiss endeavoring to come up with a numbering procedure. ST 105.003-sixty five could possibly be more than 7 characters, it’s also damaged down into four neat “chunks” https://www.watchesworld.com/a-history-of-watch-reference-numbers/