40004596, Marlborough, 504, Three-quarter head of Medusa, wings in hair, snakes at chin., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 504, Cameo, Cornelian
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