Black Bay GMT 41 mm steel case, “Terra di Siena” brown leather strap

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 matt version, the Black Bay GMTis also a nod to the early days of this watchmaking function.