40004969, Marlborough, 557, Portrait (profile right): Vespasian (?). 'Head of Galba or Vespasian'., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 557, Cameo, Onyx