40005235, Marlborough, 441, Frontal mask of a grotesque bearded face ('Davus or slave')., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 441, Cornelian

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