Jazzmaster Open Heart Auto 42mm H32705560

Offering a glimpse of its powerful inner mechanics, the Jazzmaster Open Heart lets precision take center stage with a new 42mm dial. Featuring a stunning gradient colour effect in rich green, this timepiece reveals its subtle beauty and showcases Hamilton's ever-evolving craftsmanship and attention to detail. Bringing the H-10 automatic movement into the spotlight, with an 80 hour power reserve and Nivachron™ balance spring, the Jazzmaster Open Heart Auto is fitted with a timeless, smoky brown leather strap. Discover our collection of dress watches. 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.

Source: Hamilton website, last updated Mar 2026