40001559, Poniatowski, 1839-426, HEAD OF HERCULES [BEARDED], Unknown, Christie's, London, Scarisbrick, (Charles), Esq., Daktyliothek Poniatowski 1832, Antikensammlung Berlin, Catalogue des pierres gravées antiques de S.A. le Prince Stanislas Poniatowski ([1830?]-1833), Christie's, London, May 15, 1861, lot 53, Amethyst