40004553, Marlborough, 599, Poseidon standing with trident, holding a dolphin, one foot on rocks, beside which another dolphin. Ground line., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 599, Nicolo, Roman

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