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