IWC Portuguese series, model: IW358304 automatic winding stainless steel 40.4mm, full set case material: stainless steel • Diameter: 40.4 mm, thickness: 12.3 mm, lug spacing: 20 mm • Waterproof performance: 30 meters (3 bar) • Strap: Santoni deep blue alligator leather strap, paired with a stainless steel butterfly folding clasp • Crystal: Double-sided anti-reflective curved edge sapphire crystal glass, and the back is transparent sapphire glass Core movement and functional highlights • Movement model: IWC-made Cal.82200 automatic movement, equipped with 31 jewels, with a vibration frequency of 28,800 times per hour, and containing 192 components • Power reserve: Up to 60 hours, equipped with IWC's patented Pellaton automatic winding system • Core functions: Basic three-hand dial + small seconds dial at 6 o 'clock, supporting stop-seconds function. The dial features a silver-white silver-plated dial with blue steel hands and Arabic numeral hour markers, making time reading clear and intuitive.