40004999, Marlborough, 227, Portrait (profile left): Faustina (?); Caesonia (?). The bust of a woman., Market, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), London, Wartski: A Collection of Engraved Gems, 1st - 7th October 2019, no. 45, Octagonal, Sapphire

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