Meanwhile, there’s some proof that international distributors hated the inconsistent and infrequently illogical numbering programs of their Swiss overlords. Maybe most significant with respect to horological history writ big was the debut from the “Omega” caliber in 1894, a 19-ligne, crown-set movement whose interchangeable parts were intended for straightforward support. https://www.watchesworld.com/a-history-of-watch-reference-numbers/