Absolute working condition. This clock is fully mechanical, wind up item. It does not need any power source to be operated. The Dial is a matte Black enamel with large Luminescent numerals on the hour, surrounded by Luminescent minute/second lines, with the Chrono sub-dial at 6 o'clock and the Flight time dial at 12. The Time and Flight Time hands are Green outline with luminescent filling. The Seconds hand is White. The Chrono hands are Black with Luminescence, the minute hand with a spade tip. The Dial is marked in Russian on both sub-dials, and is embossed with "2 days" and serial number. Russian USSR cockpit clock for Soviet Union Aircrafts MiG-23, MiG-25, MiG-29 and Su-2..,strategic bombers, Helicopter and transport planes. The clock has dust-proof case. Dome glass is mineral crystal. These clocks have been designed to withstand speeds of 1800 mph (2900 km/h) and altitudes of up to 100,000 feet (30 km). Built-in 27-volt heater ensures operation even at -60°C (-75°F). The clock will withstand 1.5G, and has a 27V electric connection at rear, for the internal heating plate, necessary only at high altitudes. The Case has an approx Diameter of 85mm (3 3/8"), and the clock weighs approx 550g (1 1/4lbs).