In 1967 IWC introduced its first diving watch and also another model (avaiable in gold), the Yacht Club, reference 811AD (later redesignated as 1811AD). After the initial success of the Yacht Club, in 1976 the line evolved into a series of “Club” watches. In addition to the Yacht Club, there also were the Golf Club (reference 1830) and Polo Club models (reference 1831 or 1931 without date), as well as a more boldly designed Yacht Club II in 1977 (reference 3212 with bracelet and 3211 with strap), which later often contained a quartz movement. (IWC.com)