Hamilton Jazzmaster Automatic Blue Dial H42535640 Men's Watch The Hamilton Jazzmaster Automatic perfectly showcases Hamilton's design expertise through traditional design cues and classic touches, both in its colours and components. A seamless combination of handed-down concepts and sharp modernity, the Jazzmaster offers an 80-hour power reserve and an amazing precision through its NivachronTM hairspring. The module H-10 – of which the anti-magnetic hairspring is a part - demonstrates Hamilton's exclusivity in a fantastic way!