40004538, Marlborough, 268, Confronted heads of Zeus Serapis and Isis, holding a sistrum., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 268, Yellowish cornelian, Roman

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