IWC Pilot's Watch Chronograph Spitfire - 41.0 mm Stainless Steel Case - Black Dial - Brown Calfskin Strap - IW38790341. 0 mm stainless steel case with soft iron inner case for protection against magnetic fields, 15. 3 mm thick, screw in crown, convex sapphire glass crystal with antireflective coating on both sides, black dial with luminescence, calibre 69380 automatic movement with date, day, chronograph, column wheel, hours, minutes, small seconds, approximately 46 hours of power reserve, brown calfskin strap. Water resistant to 6 bar.