
A coin watch or medal watch comprises a watch inserted into a coin or medal.1
A coin watch is typically made by slicing a coin into two disks, one thinner than the other;1 or by removing one face of a coin. A watch mechanism is then embedded into the thicker part, and the two faces joined by a concealed hinge and catch.1 When closed, the watch is hidden and the coin looks like any other.1

Noted makers of coin watches include Cartier12 and Corum.
References
References
- "Stowe House 1". Antiques Roadshow. Series 35. Episode 13. 2013-02-22. BBC. Retrieved 2013-03-19.
- "A George V 1911 five pound coin watch, by Cartier". Christie's. Retrieved 19 March 2013.