A fine French Empire patinated and gilt bronze Egyptian Revival wall clock with calendar, circa 1800, the bronze by Antoine-André Ravrio, based on the designs of Giovanni Battista Piranesi, the movement by Jean-François DeBelle

Piranesi

The design source for this clock is the series of etchings published in Rome in 1769 by Giovanni Battista Piranesi as Diverse Maniere d'adornari i cammini ed ogni altra parte degli edifizie. All the elements of the several extant versions of this clock appear in Plate 36, a design for a chimneypiece in the Egyptian style.

see:

Lawrence, Sarah E. Piranesi: The aesthetic of eclecticism and his Egyptian style. The Magazine Antiques, v. clxxii, no. 4, (October, 2007) pp. 122 - 129.