IWC Ingenieur Chronograph Racer Ardoise Dial Rubber Straps Men's Watch IW378507. Stainless steel case with a black leather strap. Fixed stainless steel bezel showing tachymeter markings. Ardoise dial with silver-tone hands and index hour markers. Minute markers around the outer rim. Chronograph - two sub-dials displaying: 60 second and 60 minute. Automatic movement with a 68-hour power reserve. Scratch resistant sapphire crystal. Screw down crown. Solid case back. Case diameter: 46 mm. Case thickness: 15 mm. Round case shape. Tang clasp. Water resistant at 120 meters / 400 feet. Functions: flyback chronograph, date, hour, minute, second, stopwatch, hour and minute counters.