Inscription: Inscribed in Greek: Saint Nicholas
[ Alfredo Barsanti, Rome (1918, through John Marshall)]
Swarzenski, Hanns, and Nancy Netzer. Enamels & Glass: Catalogue of Medieval Objects. Catalogue of Medieval Objects in the Museum of Fine Arts, Boston. Boston: Museum of Fine Arts, 1986. p. 136.
Evans, Helen C., and William D. Wixom, ed. The Glory of Byzantium: Art and Culture of the Middle Byzantine Era, A.D. 843–1261. New York: The Metropolitan Museum of Art, 1997. no. 336, p. 499.