40005259, Marlborough, 517, Frontal Bacchic mask with vine wreath., Content, (Derek J.), London, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 517, Cameo, Onyx

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