Meanwhile, there’s some evidence that international distributors hated the inconsistent and infrequently illogical numbering units of their Swiss overlords. Maybe most important with regard to horological history writ big was the debut in the “Omega” caliber in 1894, a 19-ligne, crown-established movement whose interchangeable pieces were intended for quick service. https://www.watchesworld.com/a-history-of-watch-reference-numbers/