The design of the new hamilton jazzmaster open heart turns timekeeping into something of a tease a glance at the face of the watch reveals part of the swiss automatic movement in action but not all of it the strap is crafted from croco embossed calf skin leather with elegant stitching while the 40mm case is finished with a handsome fixed stainless steel bezel housed beneath scratch resistant sapphire crystal glass the dial features rose gold toned hands stick markers with roman numerals m