From Hamilton, the Khaki Aviation Pilot Pioneer Mechanical Watch features:  Reinterpretation of a vintage military watch produced for the British Royal Air Force in 1973 Stainless steel case Black dial color  Grey NATO strap Pin buckle closure Crystal mineral Mechanical movement Powered by H-50 hand-winding movement Swiss made 80-hour power reserve Buckle width approx. 18mm Lug width approx. 18mm Case size approx. 36mm x 33mm Water Resistance: 10 bar (100 m) /145 psi (328 ft) Imported.