IWC Spitfire Pilot Series, model: IW377719, automatic mechanical movement, stainless steel, case diameter: 43MM • Movement model: Cal.79320 Automatic Chronograph movement (improved based on ETA7750) • Core data: 25 gemstone bearings, 28,800 vibrations per hour, 44-hour power reserve, 240 parts • Functions: Hours, minutes, regular second hand; Dual display of day of the week and date at 3 o 'clock. Three-eye chronograph (30-minute chronograph sub-dial, 12-hour chronograph sub-dial, small seconds sub-dial), the red tip of the chronograph second hand is the signature design.