National Museum of Asian Art
Disk (<em>bi</em> 璧)
ca. 3300-2250 BCE
Perforated disk of the type pi [bi] 璧; bored obliquely from both sides, leaving median ridge; mottled light to medium dark greens with some wine-red strata; satin smooth surface with areas of grayish-white incipient disintegration; several small smooth saw marks on both sides. (Rim broken in two areas and two chips.)
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