Disc, China, Warring States Period (approx. 480-221 BCE). Nephrite. Diam. 5 1/2 in x D. 1/4 in, Diam. 13.97 cm x D. .64 cm Diam. inner hole 2 3/4 in. The Avery Brundage Collection, B60J504 © 2017 Asian Art Museum Chong-Moon Lee Center for Asian Art and Culture.