Owned by Charles Félix, the Duke of Choiseul-Praslin, in France, this double-sided pocket watch crafted by Breguet features a retrograde perpetual calendar, equation of time, and moonphase display.

A patron and benefactor of Abraham-Louis Breguet, Charles Félix financed the watchmaker's work on multiple occasions. He acquired this particular timepiece in 1805. It now resides in the collection of the Musée des Arts et Métiers, in Paris.