40004876, Marlborough, 498, Apollo and heroes at Troy. Signed YDROU (Natter)., UDROU, Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 498, Cameo, Sardonyx

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