Hamilton Watch Khaki Navy Frogman 41 H77455331. The Khaki Navy Frogman Automatic stands out for its technical performance and distinctive look. Its 41mm stainless steel case features a screw-down crown protected by a robust bridge-shaped crown guard to ensure its 30 bar (300m) water-resistance, a nod to the original Frogman’s design. Boasting a black dial with touches of Super-LumiNova® to ensure precise readings under any circumstances, this 41mm Khaki Navy Frogman Automatic is fitted with a green waved rubber strap evoking the moving sea surface. Functional and wearable at once, this timepiece is a hero underwater and on land.