The slim pocket-style case and the blued steel hands of the Khaki Navy Pioneer Auto Chrono are reminiscent of the Hamilton marine chronometers of the 1940s in the "official and gentleman" style. The all-new H-21 automatic chronograph movement adds a perfect sporty touch to today's sailors. The H-21 is a powerful automatic chronograph movement with an enhanced 60-hour power reserve, making it perfect for the needs of the sportiest models. The H motif on the oscillating weight leaves no doubt about who made this movement.