Enhancing the Black Bay One One with yellow gold creates a version named S&G, for Steel & Gold. TUDOR derived the characteri stic aesthetic elements of the Black Bay One S&G model from its history. The overall shape, as well as the domed dial and cryst a l, come from the first TUDOR divers watches. In this version the lines and proportions of the Black Bay One are retained, while t he rotating bezel and the winding crown are made from yellow gold.