Hamilton Watch Khaki Navy GMT. The Navy GMT timepiece by Hamilton is exceptionally functional and resilient. The watch is equipped with Swiss made ETA 2893-1 automatic calibre that performs 28 800 vibrations per hour and has 21 bearing jewels. A semi circular aperture is used to display information about the second time zone. The watch comes with a special internal bezel that marks elapsed time. A date display is positioned at the 3 o clock mark. Hands and indices are luminous for improved night time visibility. Additional useful features include screw down crown, see through case back and scratch resistant sapphire crystal glass.