Let precision take center stage with the 40mm Jazzmaster Open Heart and its smoky burgundy cut-out dial, revealing the subtle beauty of this timepiece's 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 Hamilton's ever-evolving craftsmanship and attention to detail. WATCH Collection: Jazzmaster Movement: Automatic Case size: 40mm Thickness (mm): 11.05 Dial color: Silver Case material: Stainless steel Crystal: Sapphire Lug width: 20mm Power reserve: 80 hour Water Resistance: 5 bar (50m)/73 psi (164ft) Anti Reflection: Yes Open Case Back: Yes Nivachron: Yes MOVEMENT H-10 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. BRACELET/STRAP Strap type: Stainless steel Buckle type: Folding clasp Buckle width: 18mm REF: H32675551