The IWC Portofino Chronograph (ref. IW391025) takes its design cues from the 1960s, with elegantly sporty push-buttons and chronograph displays. The chronograph in 18-carat 5N gold with a silver-plated dial has a convex sapphire glass and and 5N gold numerals. It is powered by the tried and tested self-winding 75320 caliber with its 44-hour power reserve. The case back features an exquisite engraving showing a view of the harbour at Portofino. This watch comes with a dark brown alligator leather strap.