40004609, Marlborough, 160, The bust of Athena wearing a helmet with a bearded head decorating the forepart, and an aegis with winged Medusa head., Walters Art Museum, Baltimore, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), 42.1198, Agate, Renaissance

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