National Museum of Asian Art
Disk (<em>bi</em> 璧)
ca. 3300-ca. 2250 BCE
Perforated disk of the type pi [bi] 璧; bored from both sides leaving slight median ridge; finely mottled reddish browns with one greenish streak of much harder material (jade [?]); satin smooth surface, irregular proportions in diameter and thickness. (Rim chipped.)
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