Hydroconquest GMT now comes with 43 mm-diameter black dial, with the exclusive Longines GMT calibre L844.5. It boasts extreme precision and a power reserve of up to 72 hours.A black sunray dial, unidirectional rotating bezel in black ceramic, water resistance to 30 bar (300 metres) and screw-in crown and screw-down case back are the signature features of this watch inspired by the world of water sports. The model comes with a stainless steel bracelet.