ELIOT - Likely a patrol clock. Includes the main body and one key only. The case is made of aluminum and covered with leather. The movement is likely brass. For those interested in industrial history or collecting vintage watches. This is a rare clock, so what do you think? Diameter: Approximately 13cm Width: Approximately 5.6cm Weight: Approximately 1.07kg One key is used for winding the mainspring, setting the time, and locking the back cover. Operation confirmed.