Complete set, IWC, Portuguese series, model: IW371604, automatic winding, stainless steel, case diameter: 41mm • Movement: IWC's self-produced Cal.79350 automatic chronograph movement, column wheel structure, 28,800 frequency, 44-hour power reserve, 32 gemstone bearings, transparent case back for admiring the movement's finishing • Case: Made of stainless steel, with a diameter of 41mm and a thickness of 12.3mm. The wearing size is moderate and suitable for most wrists • Dial: Ivory white (cream white) dial, 18K rose gold hands and hour markers, 30-minute counter at 3 o 'clock, 12-hour counter at 6 o 'clock, small seconds counter at 9 o 'clock, classic Portuguese chronograph layout • Crystal: Sapphire crystal, paired with a transparent case back made of the same material