Robert-Houdin Square Dial Mystery Clock. Paris, mid-nineteenth century. Two-handed glass dial mystery clock, beveled dial bearing Roman and Arabic numerals, the former within a shield form, dotted minute track, signed ?Henry Robert (Houdin)/Rue De Vendome,? surmounted by an armorial ornament (presently detached) and contained within a gilt frame elevated by a pair of swans on a marble platform. Overall height 12?. Frame 9 ? x 7?. Base 10 ? x 6 ??. Slight losses to gilt finish, bottom dust plate probably replaced, but overall a wonderful and original piece.