This U.S. WWII CDIA AeroNaval Clock (Waltham) is a fantastic piece of history. It has a diameter of 3⅓\" (82 mm) and is 1⅓\" (37 mm) deep. This clock is an original piece that was manufactured in the United States during the world war II (1939-45) era. It is a great item for collectors of militaria and is perfect for those who have an interest in naval history.