40004923, Marlborough, 371, Portrait (frontal): Augustus. Frontal bust, probably of Augustus, the head veiled., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), GR1996.6-12.1, Cameo, Chalcedony

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