40000422, Poniatowski, T392, POLYGONUS AND TELEGONUS, THE SONS OF PROTEUS, KILLED BY HERCULES, WHOM THEY HAD CHALLENGED TO WRESTLE WITH THEM, KROMOU, Kromos, Unknown, Catalogue of A Rare Collection of Antique and Medieval Gems, (...) for the Charity Organization Society (...) of NY; Tiffany, 10.-16.3.1902, 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, lot 959, Sardonyx

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