IWC Portofino series, model: IW391029, automatic winding, stainless steel, case diameter: 42mm. Case and dimensions: It features a 42mm stainless steel case with a thickness of 13.6mm. The lines are simple and elegant, representing the signature dress watch style of the Portofino series. Dial details: The black sunray dial is paired with bar hour markers and silver hands. There is a dual display window for day and date at 3 o 'clock, a small seconds sub-dial at 9 o 'clock, a 30-minute chronograph sub-dial at 12 o 'clock, and a 12-hour chronograph sub-dial at 6 o 'clock. The time reading is clear and the layout is balanced. Strap and buckle: It is equipped with a black alligator leather strap and a stainless steel pin buckle. It can be paired with formal or casual wear. It is water-resistant to 30 meters and is only suitable for daily wear. It does not support swimming, diving and other scenarios.