IWC, Portofino, model: IW356516 Automatic Mechanical 18k rose gold 40mm IWC / IWC Portofino IW356516, automatic mechanical, entire watch made of 18k rose gold. The case diameter is 40 millimeters, with date display and the bezel originally set with diamonds The case is made of 40mm 18K rose gold and features a diamond-encrusted bezel with brilliant-cut diamonds. The overall texture is warm and luxurious. Dial: The sunray dark grey dial is paired with rose gold bar hour markers and Roman numeral hour markers. There is a date window at the 3 o 'clock position. The design is clean and neat, versatile and not picky about style. The strap: A dark brown alligator leather strap with a pin buckle is a classic configuration for dress watches.