The Jazzmaster Open Heart 42mm perfectly balances tradition and innovation. Its precise cut-out design reveals Hamilton\'s Swiss-made automatic movement in action beneath a striking silver dial with blue indexes and hands. Add sophisticated personality with a matching blue leather strap. A three-hand movement with or without a date function and boasting a superior power reserve of 80 hours, the H-10 appears with intricate contrasting snail and pearled patterns for the American Classic models it drives and streamlined surfaces for the pilots’ watches.