40004535, Marlborough, 595, Zeus Serapis enthroned frontally, holding a sceptre, his eagle on the ground. Ground line., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 595, Sardonyx

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