40005096, Marlborough, 766, Portrait (profile left): Emperor (?).Laureate bearded head., Blenheim Palace, Woodstock, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 766, Nicolo