IWC, Portofino series, model: IW459401 Automatic winding The case is made of stainless steel, with a diameter of 40mm, a thickness of 11.1mm, and a water resistance of 30 meters for daily use. It is paired with a dark brown fishskin strap (20mm wide), a silver dial with Roman numeral hour markers, and is equipped with a 35800 automatic movement, 25 jewels, a power reserve of 50 hours, and a frequency of 28,800 vibrations per hour. The core functions include moon phase display and a central seconds hand with a stopper. Double-sided anti-reflective convex sapphire crystal with a solid case back design.