This piece is half of a bivalve mold. The two parts were attached by the three holes, visible at the top and bottom. The funnel-shaped cuttings along the straight edge are the sprues through which the liquid metal was poured into the mold.
Richter, Gisela M. A. 1953. Handbook of the Greek Collection. pp. 17, 169, pl. 9, Cambridge, Mass.: Harvard University Press.
Metropolitan Museum of Art. 1979. Greek Art of the Aegean Islands. no. 45, p. 91, New York: The Metropolitan Museum of Art.
Reinholdt, Claus. 1993. "Der Thyreatis-Hortfund in Berlin." Jahrbuch des Deutschen Archäologischen Instituts, 108: p. 22, figs. 29-30.