40004899, Marlborough, 591, A bust of Cleopatra, full-faced, bare-breasted, with a vulture headdress, holding a snake. Very high relief., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 591, Cameo, Onyx