The IWC Portofino 3513 is a timeless men's watch with an automatic movement that was sold from the late 1980's to the early 2000's. It comes in either a 34mm yellow gold or stainless steel case, and uses either a caliber 37521 or 30120 movement depending on when it was made. The reference IW3513-01 has a yellow gold case and a classic white dial.