H-10 (ETA 2824-2 base)

Hamilton's signature modified ETA 2824-2 with an extended 80-hour power reserve achieved by lowering the beat rate from 28,800 to 21,600 vph and using a longer, thinner mainspring. This means three full days of runtime from a single wind, a significant upgrade over the standard 38-hour reserve. Found across the Khaki Field and Jazzmaster lines, it represents exceptional value in the sub-$1000 Swiss automatic segment.