After Robert-Houdin. Glass Column Mystery Clock. A handsome example of Robert-Houdin?s double mystery clock, with a clear glass dial to which a single arrow-shaped hand is attached, Roman numerals with minute track, lettered ?Robert-Houdin/Paris? and mounted to a clear glass tube terminating in four griffins, seeming to provide no connection between the clock and any hidden mechanism. Maroon plush-covered base with gilt appliques, rounded feet. Height 21 ??. Dial 5 1/8? diam. Base 7 x 7?. Interior of base shows inconsistencies compared with earlier examples, later movement, new screws prevalent, dial bearing an unusual font for the signature, overall quality and finish inconsistent with original examples.