Automatic | 45mm | H77906940 Designed with pilots in mind and built for a life of adventure, the Khaki Aviation X-Wind Automatic Chronograph flies through the crosswinds in a bold new guise, with camouflage patterns and new color variants extending across the dial, strap and case. Featuring an inner rotating bezel and an anti-magnetic Silicon hairspring, this high-performance piece has combat-chic looks and assertive style. Watch Reference : H77906940 Caliber : H-21-Si Collection : Khaki Aviation Movement : Automatic Case size : 45mm Dial color : Blue Case material : Stainless steel Crystal : Sapphire Lug width : 22mm Power reserve : 60-hour power reserve Water Resistance : 10 bar (100m)/145 psi (328ft) Anti Reflection : Yes Open Case Back : Yes Screw Down Crown : Yes Silicon Balance Spring : Yes Bracelet/Strap Strap reference : H6007791011 Strap type : Textile Buckle type : Pin buckle Buckle width : 22mm The H-21-Si is an automatic chronograph movement featuring a state-of-the-art balance spring made from the anti-magnetic material silicon for enhanced resistance to extreme atmospheric conditions. With an extended 60-hour power reserve, this powerful caliber reliably keeps and measures time via two or three sub dials at 6, 9 and/or 12 o'clock, and start/stop and reset pushers on the side.