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 pronounced median ridge; closely mottled shades of green and golden to dark browns with spots of translucent strata; partially covered with smooth gray incipient disintegration; long shallow gouges or saw marks on both surfaces. (Rim rough and broken in several areas.)
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