The IWC Portofino Chronograph (ref. IW391027) takes its design cues from the 1960s, with elegantly sporty push-buttons and chronograph displays. The stainless steel chronograph watch has a convex sapphire glass and appliqué Roman numerals on its silver-plated dial. It is powered by the tried and tested self-winding 75320 caliber with its 44-hour power reserve and comes with a brown alligator leather strap.