IWC Pilot's Watch Chronograph - 43 mm Stainless Steel Case - Black Dial - Black Santoni Calfskin Strap - IW37770943 mm stainless steel case with soft iron inner case for protection against magnetic fields, 15 mm thick, engraved back, screw in crown, convex sapphire crystal with antireflective coating on both sides, black dial, calibre 79320 self winding movement with date and day display, stopwatch function with hours, minutes and seconds, small hacking seconds, approximately 44 hours of power reserve, black Santoni calfskin strap. Water resistant to 6 bar.