The Black Bay GMT is an extension of the Black Bay line with a highly functional complication: a multiple time-zone function – also known as a GMT function. Recognisable by its rotatable bezel, which derives its deep blue and burgundy colour theme from other models in the Black Bay line, but in a matte version, the Black Bay GMT is also a nod to the early days of this watchmaking function. Enhancing the Black Bay with yellow gold capping 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 first TUDOR divers’ watches. In this version the lines and proportions of the Black Bay are retained, while the rotating bezel and the winding crown are capped with yellow gold.