National Museum of Asian Art
Disk (<em>bi</em> 璧)
ca. 3300-2250 BCE
Perforated disk of the type pi [bi] 璧; bored from both sides, leaving median ridge; mottled pale to dark greens, with silvery areas of incipient disintegration, more profuse on one side; two shallow saw marks. (One cracked area near rim and two chips.)
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