" At First, these wristwatches were one-off or customized creations That usually appeared quite a bit similar to the pocket watches from which they progressed. But quickly, wristwatches took on their own aesthetic, with their own complex innovations to solve new issues introduced by wrist-borne timekeepers. In 1892 they released https://www.watchesworld.com/a-history-of-watch-reference-numbers/