40005250, Marlborough, 514, A facing bald mask., Norton, (Martin Norton estate), London, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 514, Cameo, Blood red sard

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