40000438, Poniatowski, T408, ACHELOUS VANQUISHED BY HERCULES [HERCULES TEARING OFF THE HORN OF ACHELOUS], 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 1006, Sardonyx