The IWC Portofino 3513 is a timeless watch for men, with a self-winding mechanism. It was originally released in the late 1980s and remained popular until the early 2000s. You could choose between a 34mm case in yellow gold or stainless steel, both with either a caliber 37521 or 30120 movement, depending on when it was made. The reference IW3513-25 features a stainless steel case and a classic black dial with Breguet-style numerals.