IWC Schaffhausen Portofino Chronograph

The IWC Portofino Chronograph, reference IW391016, is a chronograph with a 42 mm steel case. The case has a thickness of 13.6 mm. The movement is self-winding and has a 44-hour power reserve, 25 jewels and 240 components. The black dial has a day and date display and small hacking seconds beneath convex sapphire glass with antireflective coating on both sides. The watch is on a mesh steel bracelet. A water-resistance rating of 30 metres applies to the case. Calibre 75320 operates at a frequency of 28,800 vibrations per hour.