40005192, Marlborough, 511, A cavalry combat. Seven armed horsemen with shields with head devices, spears, and a standard labelled S.P.Q.R. at the left, one with an elephant outlined on it at the right, in a mêlée. At the left a man on a plunging horse,and a fallen man wearing a tunic, holding a standard. Shield devices have grotesque frontal heads., Ladrière, (Guy), Paris, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 511, Cameo, Onyx, Renaissance

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