IWC Portofino series, Chronograph, diameter: 42mm, black dial with leather strap, model: IW391002, automatic mechanical movement, stainless steel, single watch. The classic formal chronograph style continues the simple and elegant tone of the Portofino series. The combination of a black dial and a stainless steel case is low-key and steady, paired with an alligator leather strap, suitable for business formal wear scenarios. At the same time, the chronograph function can also meet the needs of light sports and daily chronograph. Practical timing and calendar functions The dial adopts a "three-eye" layout: the 30-minute counter at 3 o 'clock, the 12-hour counter at 6 o 'clock, and the small seconds counter at 9 o 'clock. Combined with the day and date display window on the right, the information reading is intuitive and clear.