The form of a Tasse Cornet was developed 1787-1788 for Marie Antoinette's dairy at Rambouillet. As the date letter on the present lot is for 1782, that these marks are spurious cannot be debated. See Aileen Dawson, French Porcelain, A Catalogue of the British Museum Collection, London, 1994, p. 242, cat. no. 197 for a teacup and saucer with spurious Buen Retiro fleur-de-lys mark, the decoration described as probably a 19th century addition and very similar to that on the present lot.