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 1. Instrument dial: Charcoal grey radiating pattern dial, large Arabic numeral hour markers, with luminous coating, clear time reading at night, replicating the style of old fighter jet instrument panels 2. Flight Marking: The triangular inverted mark at the 12 o 'clock position plus the dots on both sides is the most recognizable feature of the IWC Pilot series, derived from the distance measurement marks of aviation instruments 3. Three-eye chronograph layout: The small seconds dial at 9 o 'clock, the 30-minute chronograph dial, and the 12-hour chronograph dial are arranged in layers, with clear scales and no visual interference 4. Day and Date Window: An integrated window at 3 o 'clock, displaying both the day of the week and the date simultaneously, which is highly practical