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; pale greenish white with specklings and delicate veins of darker green; gouges from circular saw on both sides; surfaces satin smooth but uneven in contours and thickness. (One chip on rim.)
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