WWII US Navy 24 Hour Military Clock by Chelsea Clock, Boston-This is produced in black bakelite. It registers 24-hour military time and works intermittently, meaning it will work for an hour or so and then stops and has to be bumped to get it going again. We include a reproduction key so you can wind it and use it as you please. The face says "Chelsea Clock Co, Boston" followed by "U.S. Navy, Ser. No 84795E". The movement has the serial number 480535 which indicates production some time in 1945. Overall good condition!