ca. 3300-2250 BCE
Perforated disk of the type pi [bi] 璧; bored mostly from one side; mottled light to dark shades of brown with scattered spots of greenish translucent strata; profuse grayish coating of disintegration, especially in veins and breaks; proportions and surface contours uneven. (Rim and some surface areas roughened with chips and cracks.)
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