The S-shape of this brooch is in fact the body of a fantastic animal with a bird’s head at either end.
J. Pierpont Morgan, London and New York (until 1917)
Ricci, Seymour de. Catalogue of a Collection of Gallo-Roman Antiquities Belonging to J. Pierpont Morgan. Paris: C. Berger, 1911. no. 199, pl. X.
Foltiny, Stephen. History of the Collection of Migration Period Finds. Vol. III. New York: The Metropolitan Museum of Art, 1973. pp. 35-36.
Foltiny, Stephen. "Langobardic Fibulae from Italy in the Metropolitan Museum of Art in New York." Acta Toscana 1 (1974). pp. 29-30, fig. 1.
Brown, Katharine R. Guide to Provincial Roman and Barbarian Metalwork and Jewelry in the Metropolitan Museum of Art. New York: The Metropolitan Museum of Art, 1981. p. 22, fig. 32.
Brown, Katharine R., Dafydd Kidd, and Charles T. Little, ed. From Attila to Charlemagne: Arts of the Early Medieval Period in the Metropolitan Museum of Art. New York and New Haven: The Metropolitan Museum of Art, 2000. p. 155, 348, fig. 13.20.