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