Mystery watch
Videos
A mystery watch or mystery clock, in horology, is a timepiece whose working is not easily deducible, because it seems to have no movement at all, or the hands do not seem to be connected to any moveme
Montre mystérieuse (mystery watch), circa 1889, Musée d'Horlogerie of Le Locle, Switzerland. It is the first transparent watch.
Coin watch
Videos
A coin watch or medal watch comprises a watch inserted into a coin or medal.
VC coin watch, with attachments for a wrist strap
Corum coin watch