IWC, Portuguese series, model: IW390212, automatic mechanical, titanium alloy, case diameter: 45.4 mm • Case: Polished brushed stainless steel case with wide anti-slip chronograph pushers on both sides • Strap: Black rubber diving strap, with a grid anti-slip texture on the surface, waterproof and resistant to seawater corrosion • Water resistance: 120-meter professional diving water resistance, suitable for swimming, snorkeling, and yacht outings. Carbon fiber texture dial: All-carbon fiber black dial, lightweight material, with a sporty and high-end feel, different from the ordinary Portuguese white dial Sailing boat timing function: The red and white scale on the outer circle serves as a countdown scale for sailing races, specially developed for sailing events. The red central timing second hand has extremely high recognition Double timing dial layout: The secondary dial at 6 o 'clock is printed with the "YACHT CLUB" logo, the minute timing dial at 12 o 'clock, and the quick date window at 3 o 'clock. Scale color scheme: Silver Arabic numeral hour markers, paired with white track scales, ensure clear time reading in strong light or underwater