“Each individual model tried to have logic of their numbering procedure but unsuccessful miserably,” Mandelbaum ongoing. “It just signifies the overall absurdity on the Swiss attempting to come up with a numbering system. ST 105.003-65 might be much more than seven characters, it’s also damaged down into 4 neat “chunks” https://www.watchesworld.com/a-history-of-watch-reference-numbers/