“Each model tried to have logic of their numbering method but unsuccessful miserably,” Mandelbaum continued. “It just signifies the entire absurdity of the Swiss endeavoring to come up with a numbering method. ST 105.003-sixty five may very well be over 7 figures, it’s also broken down into four neat “chunks” https://www.watchesworld.com/a-history-of-watch-reference-numbers/