Citizen Men's NP1010-78E Collection Mechanical Open Heart WatchProduct Highlights A three dimensional design combining two separate rings for a sense of depth and weightiness. Features include a sub dial with a 60 second hand and an open heart design allowing you to admire the delicate movement of the balance wheel, the heart of a mechanical watch, from the 7 o'clock position on the dial. The transparent case back allows you to enjoy the movement of the rotating weight and the mechanics. The simple adjust feature