The relief pattern of these brooches was created by working a thin sheet of metal from the reverse side. Roman coins were the inspiration for such designs.
Stanislas Baron, Paris; J. Pierpont Morgan, London and New York (until 1913); Estate of J. Pierpont Morgan(1913–1917)
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. 249, 350, fig. 21.29.