The IWC Portofino 3513 is a timeless watch for men that was sold in the late 1980s to the early 2000s. It comes in either yellow gold or stainless steel and has a self-winding movement. The case is 34mm and can hold either a caliber 37521 or 30120 movement, depending on when it was made. The reference IW3513-11 has a sleek stainless steel case and a classic white dial.