Enhancing the Black Bay 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 crystal, 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.