Introduced in the late 16th century, the Regulator dramatically improved accuracy in measuring time with the addition of the pendulum to the weight-driven movement. The "open heart" design exposes the 7-day brass movement; the antiqued brass face is engraved with large roman numerals artistically spaced by royal fleur-de-lis detailing. The antiqued brass bell on top strikes the hour, and the pendulum swings rhythmically as the weight lowers. 5.5"Wx3.5"Dx26"H. 7 lbs.