The design of the new Hamilton Jazzmaster Open Heart transforms the measure of time into something very close to seduction. The dial reveals a part of the Swiss automatic movement in action, without fully discovering it. Everything else can be left to the imagination - especially when they are hidden by quality materials and careful design details. Three-sphere movement with date and power reserve greater than 80 hours, the H-10 features elaborate colimaçon and pearly contrasting patterns for the American Classic models and clean surfaces for the pilot's watches.