This is an antique ship's clock made by Waterbury of Waterbury, Connecticut.  It was found in a New London, Connecticut estate and is marked Waterbury Jeweled.  I believe it may be U.S. Navy from the WWII era since the gentleman's father was enlisted during that time period.  It is not marked with any Naval insignia.  The case is of chrome or nickel plated brass.  The clock runs beautifully and has the ship's bell on the hour and half hour.  The front diameter  including the rim of the case is 5 1/2".  The depth of the clock is 3 7/8".  The top of the back rim is bent and split a bit at the top screw hole.  Otherwise, I would say this is in excellent condition.  A key is included.  People sometimes make a wooden base for these to display them.  It sort of transforms the ship's clock into a mantle clock, or desk clock.