Pendulux Altimeter Decorative Wall Clock, Vintage Unique Wall Clock for Outdoor and Home Decor, Black - 7.5" Diameter An enlarged version of a clock found in WWII Army Air Corps planes, this clock features a distinctive black painted aluminum to reduce glare in the cockpit. The dial is a reproduction of an authentic altimeter that displayed a planes altitude to 1000 feet, while the hands were designed to be easily seen, even when descending rapidly from 30,000 feet. It is made of aluminum solid brass with 7.5 inches in diameter. It requires one AA battery to operate.