Hamilton Khaki Field watches

The Hamilton Khaki Field is Hamilton's military-style field watch, and Hamilton says its field watches were first made to meet the demands of soldiers in the First World War. The company was founded in 1892 in Lancaster, Pennsylvania, and sent more than one million watches overseas during the Second World War. It moved production to Switzerland in 1969 and is now part of the Swatch Group.

The Khaki Field Mechanical is the line's closest link to that military past. Hamilton made a 34 mm watch for the US Army to the GG-W-113 specification, which Fratello dates to 1967–1986, and Fratello's 2018 review of the Mechanical found its dial and hands a near replica of that watch, in a 38 mm case with the hand-wound ETA 2801-2. Today's Mechanical uses Hamilton's hand-wound H-50 calibre, rated at 80 hours of power reserve. Larger Mechanicals at 42 and 50 mm carry the same idea in a bigger case.

Around the Mechanical, the Khaki Field spreads into self-winding and more modern variants. The Titanium Auto puts the field dial in a titanium case at 38 or 42 mm, the Day Date Auto adds a day and date at 42 mm, the Officer grows to 44 mm, and the King comes at 40 mm in Auto and Quartz versions. The Murph, presented in 2019, recreates the watch Cooper gives his daughter Murph in the 2014 film Interstellar; its seconds hand spells "Eureka" in Morse code.