The Jazzmaster Open Heart's design plays with the measurement of time by opening a part of its heart. A look at the dial reveals a section of the automatic movement - but not the whole. Certain parts are left to the imagination - not least because the materials used are of the highest quality and the sophisticated details inspire you to dream. The soft curves of the Jazzmaster Open Heart Lady are enhanced by a satin-finished and polished case and an openwork dial with a diamond-cut bevelled edge. Despite its romantic appeal, the Jazzmaster Open Heart Lady is surprisingly robust and water-resistant to a pressure of 5 bar, so that it meets the needs of active women in the 21st century, of which it is very aware. The new Hamilton H-10 caliber, with high-quality finishes, provides an 80-hour power reserve, so the watch continues to run precisely even if it hasn't been worn for a weekend.