The bent-up nose piece probably indicates that this helmet was dedicated at a sanctuary.
Metropolitan Museum of Art. 1930. The H. O. Havemeyer Collection: A Catalogue of the Temporary Exhibition, March 10-November 2. p. 111, New York: The Metropolitan Museum of Art.
Richter, Gisela M. A. 1930. "The Exhibition of the H.O. Havemeyer Collection: Classical Art." Bulletin of the Metropolitan Museum of Art, 25 (3): p. 75.
Richter, Gisela M. A. 1953. Handbook of the Greek Collection. pp. 34, 181, pl. 21g, Cambridge, Mass.: Harvard University Press.
Frelinghuysen, Alice Cooney, Gary Tinterow, Susan Alyson Stein, Gretchen Wold, and Julia Meech. 1993. Splendid Legacy: The Havemeyer Collection p. 118, pl. 107, New York: The Metropolitan Museum of Art.