The indistinct stamp is probably that of Denis-Louis Ancellet, maître in 1766.
These beautiful bookcases are embellished with a delicate small-scale trellis pattern first employed in the mid-1760s by various ébénistes working in the Transitional style but particularly favoured by the ébéniste du Roi Jean-Henri Riesener in the mid-1780s. In its present form, the pattern was used by him, for instance, on a small secretaire in the Wallace collection, illustrated in F. Watson, Louis XVI Furniture, London, 1960, no. 97. Ancellet was clearly inspired by Riesener's oeuvre but also collaborated with his contemporary Adam Weisweiler and a console bearing both Ancellet's and Weisweiler's stamp is mentioned by P. Kjellberg, Le Mobilier Français du XVIIIe Siècle, Paris, 1989, p. 25. In 1791, Ancellet supplied items of furniture to the Garde-Meuble Royal for the château de St. Cloud.