40004866, Marlborough, 679, Thetis, dress over head and around legs, riding on a Triton carrying a shield for her son; waves., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 679, Cornelian

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