Few dive watches have a story like the Frogman. Hamilton made the original for U.S. Navy frogman teams, and it went on to appear in the 1951 film The Frogmen. The Hamilton Khaki Navy Frogman Auto H77455331 brings that legacy into a modern 41mm diver, and this version adds a splash of personality with a green waved rubber strap designed to evoke the moving surface of the sea.

The signature detail is the bridge-shaped crown guard, a direct nod to the original Frogman, which shields the screw-down crown from knocks. Beneath it, the black dial carries Super-LumiNova on markers and hands for legibility in murky water or a dark room. Inside, Hamilton’s automatic H-10 caliber delivers an 80-hour power reserve and uses a Nivachron balance spring for better resistance to magnetism and temperature changes.

With 300 meters of water resistance, it’s a genuine tool for snorkeling, swimming and diving, yet the black dial keeps it neutral enough for daily wear. The green strap is what makes it stand out at the beach bar.

Khaki Navy Frogman Auto H77455331 technical details

• Case: 41mm stainless steel, 14.95mm thick
• Crown: screw-down with bridge-shaped crown guard
• Dial: black with Super-LumiNova markers and hands
• Movement: Hamilton H-10 automatic with Nivachron balance spring
• Power reserve: 80 hours
• Crystal: sapphire with anti-reflective coating
• Water resistance: 30 bar (300m / 934ft)
• Strap: green waved rubber with pin buckle, 20mm lug width

Navy heritage, serious water resistance and a strap with a sense of fun.