Let precision take center stage with the 40 mm Jazzmaster Open Heart and its white cut-out dial, revealing the subtle beauty of this timepiece 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 an intricate stainless steel bracelet, showcasing Hamiltons ever-evolving craftsmanship and attention to detail.