The first digital pocket watch
In the 1920s, digital Pocket watches made their appearance, marking the hours and minutes by means of digits engraved on white paste disks, visible through dial windows or apertures protected by a thin sheet of transparent celluloid. This system was also applied to some wristwatches of the same period. They have not ceased to be a novelty without more transcendence.
You'll find similar models in our collection of modern Pocket watches.