Robert-Houdin Mystery Clock. Paris, ca. 1840. Striking eight-day movement glass dial mystery clock. Ormolu-decorated bronze case supporting a gilded bezel surrounding the clear glass dial, at the center of which sits a single arrow-shaped hand. ?Second series? mystery clock; the timepiece runs and keeps time despite no apparent connection between the dial and the base. Clock chimes on the hour and half-hour. The case resting on a gilded wooden plush-covered base, the whole affixed to the black wooden base in which the original glass dome (included) rests. Height 17 ?".