Hamilton Khaki Navy watches

The Hamilton Khaki Navy is the brand's line of dive and nautical watches, and the Frogman sits at its centre. Hamilton watches were part of the kit of the US Navy's Naval Combat Demolition Units on mine-clearing missions in the Second World War. The wartime BUSHIPS watches had a canteen-style screw-down crown protector, and the locking guard over the modern Frogman's crown calls back to it. Hamilton's first mass-produced Frogman followed in 1951, the year the watch appeared in The Frogmen, a 20th Century Fox film based on Navy demolition teams and the first depiction of scuba diving on the big screen.

The Frogman Auto is the 42 mm steel version, with a black or blue dial and bezel. It runs Hamilton's automatic H-10 calibre with an 80-hour power reserve, is water resistant to 300 m and takes a 20 mm strap. The 46 mm Frogman is the size for wearing over a wetsuit: the H77805335 in titanium on the H-10, and the steel H77815130 and H77825330 and black PVD H77845330 on the H-10 ND, which wear a bulky, bumper-like guard over the screw-down crown and keep the 300 m rating. The Frogman name also covers the 40 mm titanium H77445533 on the ETA 2895-2 and the 43 mm titanium Frogman Auto Chrono on the ETA 7750.

The Scuba is the lighter side of the line. The 40 mm Scuba Auto, in blue or green, uses the same H-10 but is rated to 100 m, and Hamilton pitches it at snorkelers, surfers and beach lovers; the Scuba Auto 43 puts the H-10 ND in a larger case. The BeLOWZERO 200m Auto is a 42 mm steel diver on the ETA 2824-2, and the BeLOWZERO 1000m Auto a 46 mm, 16.7 mm thick PVD-coated watch on the ETA 2826-2.

Not every Khaki Navy is a diver. The Regatta is a 42 mm chronograph on the ETA 7750 with a blue dial, and the Seaqueen is a smaller watch at 32 or 37 mm, the 32 mm with a mother-of-pearl dial.