This object is half of a box mirror; it would have covered the reflecting surface, with the two parts attached by a hinge. The concentric rings indicate the workmanship applied even to the inside of a luxury object. NOTE - THIS IS PART B ONLY, ADJUST ACC. NO.
Richter, Gisela M. A. 1941. "A Bronze Mirror of the Hellenistic Period." Bulletin of the Metropolitan Museum of Art, 36(8): p. 168-70, figs. 1-2.
Richter, Gisela M. A. 1953. Handbook of the Greek Collection. pp. 126, 265, pl. 105h, Cambridge, Mass.: Harvard University Press.
de Puma, Richard Daniel. 2013. Etruscan Art in the Metropolitan Museum of Art. p. 189, New Haven and London: The Metropolitan Museum of Art.