08/23/2026
The Hamilton Caliber 980 is an American-made, 14/0-size manual-wind mechanical movement produced between 1934 and 1951. Built with a distinct tonneau (barrel) shape, it was specifically tailored to power Hamilton's rectangular and tank-style wristwatches. It features 17 jewels, a traditional Swiss lever escapement, a balance wheel oscillating at 18,000 bph, an overcoil Breguet hairspring, and a sub-seconds complication at the 6 o’clock position. It has a 45-hour power reserve, the 980 served as Hamilton's workhorse mid-tier rectangular caliber, finished with nickel plating and Geneva stripes.