This urn was probably produced by Paul Sormani after Gouthière's original of 1780. A similar example, signed by Sormani was sold at Christie's King Street in the sale of 19th Century Furniture and Sculpture, on 1st October 2002, lot 275
Pierre Verlet Les Bronzes Dorés Francais du XVIII Siecle, Grands Manuels Picard 1987.
Hans Ottomeyer & Peter Proschel Vergoldete Bronzen, Klinkhardt & Biermann, Munich, 1986. Cf illustration 4.3.4 on p.237.