Meanwhile, there’s some proof that Worldwide distributors hated the inconsistent and often illogical numbering systems of their Swiss overlords. Possibly most significant with regard to horological history writ substantial was the debut with the “Omega” caliber in 1894, a 19-ligne, crown-established motion whose interchangeable areas were meant for uncomplicated services. https://www.watchesworld.com/a-history-of-watch-reference-numbers/