40004881, Marlborough, 359, Full-face head of Laocoon. 'Engraved by Sirletti, according to Mariette'., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 359, Cameo, Amethyst, 18th cent.

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