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, smokky brown leather strap.