Hamilton H76419531 Khaki Aviation Pilot Pioneer MechanicalProduct Overview Featuring the hand wound movement H 50, the "Khaki Pilot Pioneer Mechanical" boasts a standard power reserve of 80 hours. This watch is a reissue of a vintage military watch produced for the British Royal Air Force in 1973. It embodies a true military spirit with its distinctive dial and rugged NATO strap. Specifications Product Number H76419531 Caliber H 50 Collection Khaki Aviation Movement Mechanical Case Size 36mm x 33mm Thickness