Said to be from Acarnania
Alexander, Christine. 1928. Jewelry: The Art of the Goldsmith in Classical Times as Illustrated in the Museum Collection. p. 37, fig. 79, New York: The Metropolitan Museum of Art.
Williams, Dyfri and Jack Ogden. 1994. Greek Gold: Jewelry of the Classical World. no. 27, p. 73, New York: Harry N. Abrams, Inc.