Let precision take center stage with the 40mm Jazzmaster Open Heart and its white cut-out dial, revealing the subtle beauty of this timepieces inner mechanics. Bringing the H-10-S automatic movement into the spotlight, with an 80 hour power reserve and Nivachron balance spring, the Jazzmaster Open Heart is fitted with a sophisticated dark brown leather strap, showcasing Hamiltons ever-evolving craftsmanship and attention to detail.