Hamilton H42565731 Jazzmaster Day Date AutoProduct Overview The Jazzmaster Day Date, which harmoniously combines a classical appearance with modern craftsmanship, is equipped with the H 40 movement that boasts a standard power reserve of 80 hours. This elegant model is elevated to a more modern aesthetic with its delicate finishing. Specifications Product Number H42565731 Caliber H 40 Collection Jazzmaster Movement Automatic Functions Date display, Day display Case Size 42mm Thickness (mm) 11.