Hamilton Jazzmaster Open Heart Leather Automatic H32205890 Women's Watch The dainty Jazzmaster Open Heart is bound to set many a hearts aflutter and pulses racing! It offers fascinating views both through the dial and the case back, displaying unique architecture of the movement inside, the new Hamilton H-10 decorated caliber. It can store a total running power of 80 hours, without losing or gaining time even a few hours before it completely runs out of power.