40000496, Poniatowski, T467, HEAD OF HERCULES, GNAIOS, Gnaios, Market, Christie's, London, Scarisbrick, (Charles), Esq., Catalogue des pierres gravées antiques de S.A. le Prince Stanislas Poniatowski ([1830?]-1833), Prendeville, J.: Explanatory catalogue of the proof-impressions of the antique gems possessed by the late Prince Poniatowski and now in the possession of John Tyrrell, Esq. (1841), Christie's, London, London, Wartski: A Collection of Engraved Gems, 1st - 7th October 2019, no. 45, Amethyst

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