Inspired by the Model 23, a cutting-edge pocket watch used by U.S. soldiers during WWII, the Khaki Aviation Pilot Pioneer's distinctive design is a tribute to Hamilton's aviation and military heritage. With ultra-legible numerals, cathedral hands and a railway track outer scale, this 38mm automatic pilot watch has a sporty yet refined character that's ready to fly. Reference : H76205530 Caliber : H-10 Collection : Khaki Aviation Movement : Automatic Case size : 38mm Thickness (mm) : 11.4 Dial color : Black Case material : Stainless steel Crystal : Sapphire Lug width : 18mm Power reserve : 80 hour Water Resistance : 10 bar (100m)/145 psi (328ft) Anti Reflection : Yes Open Case Back : Yes Nivachron : Yes BRACELET/STRAP Strap reference : H76205530 Strap type : Cow leather Buckle type : Pin buckle Buckle width : 16mm Movement: A three-hand movement with or without a date function and boasting a superior power reserve of 80 hours, the H-10 appears with intricate contrasting snail and pearled patterns for the American Classic models it drives and streamlined surfaces for the pilots? watches.