HAMILTON Jazzmaster Open Heart Auto Automatic | 40mm | H32675140A vibrant smoked dial draws the eye inward to the precision cutouts of the Jazzmaster Open Heart. Offering a captivating glimpse at the movement underneath, its contemporary style is both unique and versatile. H 10 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