In the meantime, there’s some proof that Global distributors hated the inconsistent and infrequently illogical numbering devices of their Swiss overlords. Inside, you’ll find the trademarked Citizen eco-drive motion. It powers your watch with gentle, so you don’t have to have a battery to tell time. It’s sustainable and trustworthy. https://www.watchesworld.com/a-history-of-watch-reference-numbers/