Hamilton
navigation h3 usnavy pilot - Tritium RadioActive Symbol

The vintage military watch Hamilton, worn by US Navy crews in the 1980s, reflects the classic appearance of American military timepieces from the second half of the 20th century (specification: MIL-W-318-B in the US military watch nomenclature from 1964): a highly legible black dial with white markings for maximum contrast, small tritium-lumed indexes (to preserve night vision during low-light reading and harmonize with cockpit displays), a circular railroad-style minute track with 60 divisions, and both 12-hour and 24-hour time displays in Arabic numerals. The hands feature a central seconds hand paired with a 7-jewel manual-winding movement, shock-resistant and precise enough for accurate time setting and synchronization during operations. Two luminescent hour and minute hands with arrow tips complete the display, while the small screw-down case back allows the watch to be worn over or under a battle dress or uniform with ease.

The screw-down case back bears all the markings and specifications required by the military tender, including the manufacturer name and assignment number for traceability. The crown is designed to be easily operated without snagging during missions, featuring a knurled edge for better grip. After 1979, US Army standards required all materials using tritium-based luminescent paint to display the radioactive symbol on the dial. This symbol is located to the right of the central axis, opposite the "H3" marking, which identifies the luminescent compound used.

The Hamilton movement is equipped with 7 jewels, a feature identified by the MFG Part N° 39988 engraved among the case back markings. This particular movement includes polymer-based balance wheel bearings, a requirement from the US military specifications to improve moisture resistance. Based on the Durowe 7420/2 caliber, it operates at a frequency of 21,600 vibrations per hour, includes a hacking seconds function for precise synchronization via reverse or counterclockwise hand adjustment, and offers a 42-hour power reserve.

This model comes from Lot B of the US Army's May 7, 1975 contract, for which four suppliers were selected: Timex, Stocker & Yale, Marathon, and Hamilton. Timex was the only one to produce plastic cases (more economical), while the others used steel. Hamilton’s watches represented the most premium production and were mainly issued to US NAVY flight crews and officers. All models were supplied with a green olive fabric strap, type II-Mil-S-46383B, featuring a reinforcement loop and black buckle, just like the one offered here. Lastly, the crystal is made of Hesalite with anti-scratch and anti-reflective surface treatment. This watch succeeded the Benrus and Bulova DTU2A/P models used during the Vietnam War.

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