Pendulux Heavy Cast Aluminum Navy Master Clock, Elegant Reproduction of a 1939 United States Navy Ship Wall Clock - 12" Diameter Pendulux Aluminum Navy Master Clock is the exact scale reproduction of a 1939 US Navy mastership clock. It is authentic in every detail, including an operating sub dial with seconds hand. This clock is modeled after the clocks mounted in the operations room of large vessels, that control all other clocks on the ship. The heavy aluminum case is made to withstand the heavy abuse of the seas when on sail. The solid cast aluminum case weighs 9 lbs., 12 inches in diameter.