Another example in plaster with the evidence of the cachet d'atelier is in the Staatliches Museum in Schwerin. Another plaster used for pointing and a marble were with the Larcade Gallery, Paris. The attribution of the present example and the other versions is cemented by the appearance on the art market in 1955 of a signed terracotta of 1786. The identification of the sitter was confirmed by the sellers, who were descendents of Auguste-Romain Bourge (b. March 4, 1786).

Cf. G. Giacommeti, La Vie et L'Oeuvre de Houdon, Paris, 1928, Vol. II, pp. 197-199, illus. and L. Reau, Houdon, Paris, 1964, Vol. I, cat. no. 90A, Vol. II, p. 26, pl. XLII and H.H. Arnason, The Sculptures of Houdon, New York, 1975, p. 84, fig. 174, p. 117, footnote 210 for further information on the portrait