40004537, Marlborough, 597, Radiate Jupiter-Serapis enthroned between Isis holding a sistrum, and Minerva holding a Victory who crowns her, within a summary zodiac disc which is carried by a kneeling Atlas., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 597, Sapphirine chalcedony, Renaissance

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