Product details:

This enlarged Altimeter Wall Clock is modeled after a replica altimeter instrument used in WWII aircraft. Manufactured of aluminum with solid brass accents, Clock's authentic dial houses the remnants of a sub-dial that marked altitude per thousand feet, while the main hands marked altitude per ten and hundred feet. Keyhole hanger for easy display. Measures about 7l x 7"w x 1.5" thick with a 5" dia. face. Operates on one AA battery."