40004949, Marlborough, 57, Double portrait (profile left): Germanicus; Agrippina. Conjoined heads of 'Germanicus' and 'Agrippina'., Metropolitan Museum of Art, New York, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), 39.22.18, Cameo, Onyx

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