40005012, Marlborough, 378, Portrait (profile left): emperor, uncertain. Laureate portrait of a man as a Roman emperor in armour., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), MLA99.7-19.1, Cameo, Onyx

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