The Jazzmaster Open Heart lets precision take center stage with a new 42mm dial. Featuring a captivating midnight blue dial that sparkles, this showstopping timepiece fuses the modernity of urban architechture with the infinity of the cosmos. Showcasing Hamilton's ever-evolving craftsmanship and attention to detail, the dial brings the H-10 automatic movement into the spotlight. With its 80 hour power reserve and Nivachron™ balance spring, the Jazzmaster Open Heart Auto is fitted with an elegant blue leather strap.