IWC Aquatimer Chrono Automatic Watch . Caliber 79320, Mechanical chronograph movement, Black rubber strap with push button release safety clasp, Titanium case, Black dial with indexes, 25 jewels, Power reserve to 44 hours, Day and date indicator at 3o'clock position, Small second with stop function, Mechanical rotating inner bezel, screw in crown, Convex sapphire glass, Water resistant to 120 meters, Case diameter: 42 mm. # 3719-018 #.