" Initially, These wristwatches were a single-off or custom creations that often seemed quite a bit such as the pocket watches from which they evolved. But before long, wristwatches took by themselves aesthetic, with their own individual complex improvements to solve new complications presented by wrist-borne timekeepers. Hublot’s Unique edition https://www.watchesworld.com/a-history-of-watch-reference-numbers/