Enhancing the Black Bay with yellow gold creates a version named S&G, for Steel & Gold. Tudor derived the characteristic aes thetic elements of the Black Bay S&G model from its history. The overall shape, as well as the domed dial and crystal, come fro m the first Tudor divers watches. In this version the lines and proportions of the Black Bay are retained, while the rotating beze l and the winding crown are made from yellow gold.