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. Some things can be left to the imagination - especially when they are clothed in sumptuous quality materials and fine design detail.JAZZMASTERStriking a perfect balance between tradition and sophistication, the Jazzmaster collection offers wearers the ideal timepiece for milestone moments, and beyond. CELEBRATING CRAFTSMANSHIPOffering a captivating glimpse at the movement underneath, its contemporary style is both unique and versatile. SELF-WINDINGWrist movements cause the inner rotor to swing, transferring energy to the mainspring, and powering your timepiece. STAINLESS STEEL CASEA highly resistant alloy composed of steel and chromium. It can be worked to resemble a precious metal. It is nearly impervious to rust, tarnish, and corrosion. SAPPHIRE CRYSTALSynthetic sapphire crystal is a tough scratch-resistant material, only diamonds could leave a mark. H-10 CALIBERA three-hand automatic movement boasting a superior power reserve of 80 hours and featuring a Nivachron™ balance spring. WATER RESISTANCEYour timepiece is resistant up to 5 bar (50m) / 73 psi (164 ft).