" At The outset, these wristwatches had been one-off or custom creations That usually seemed quite a bit just like the pocket watches from which they advanced. But quickly, wristwatches took on their own aesthetic, with their own personal specialized innovations to solve new difficulties presented by wrist-borne timekeepers. Hublot’s https://www.watchesworld.com/a-history-of-watch-reference-numbers/