40005257, Marlborough, 328, Frontal bearded mask., Market, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), Sothebys 2 July 2019, lot 81 (for 32,500GBP), Cameo, Sardonyx

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