Citizen Men's Watch - Citizen Collection Mechanical Open Heart NH9131-73LProduct Highlights strong> Experience the delicate movement of the balance wheel, the heart of a mechanical watch, through the open heart design at the 6 o'clock position on the dial of this classically modern timepiece. The radial pattern on the dial emanating from a circular window is a distinctive feature of the design. The transparent case back allows you to admire the oscillating weight and inner workings of the movement. Product Overview A