40000950, Poniatowski, T912, APOLLO REPULSING DIOMEDE, ALLIONOS, Allion, Paris, Cabinet des médailles, Bibliothèque nationale de France, Seguin, (Jean-Charles), 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, H2801, inv.298, Amethyst

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