Solid cast aluminum case weighs 9lbs., 12” diameter. An exact full size reproduction of a vintage 1939 US NAVY master ship clock. Our clock is authentic in every detail, from the black non-glare Arabic dial to the operating sub dial with seconds hand. These clocks were mounted in the operations room of large vessels such as aircraft carriers, and it controlled other clocks which were attached to it electrically. The heavy case was made to withstand the heavy knocks and abuse that could happen on the high seas. Accurate quartz movement uses two AA battery (not included).