Watchman's Tell tale Clock by Llewellin

Metal. Case size approx 4.75" diam x 2" high

High quality clockwork movement with lever escapement. Made by Llewellins Machine Co. Ltd. Bristol. England. Case marked "No.M11155/1 L class". A special numbered key is kept at each point on a watchmans round . This is inserted and turned to print the key number and the time. There is a mechanism to detect fraudulent interference