Hamilton H42535541 Jazzmaster Skeleton AutoProduct Overview The "Jazzmaster Skeleton" features a 40mm case diameter, showcasing the precision and the mysterious beauty of the internal mechanism of the timepiece through its blue cut out dial. Equipped with a Nivachron hairspring and boasting an automatic movement H 10 with a standard power reserve of 80 hours, the "Jazzmaster Skeleton" is paired with a sophisticated brown leather strap, embodying Hamilton's evolving craftsmanship and attention