Lot 209. A green and brown jade disc, bi, Zhou dynasty. Diameter 16.2 cm, 6⅜ in. Estimate: 6,000 - 8,000 GBP. Lot sold 11,250 GBP. Photo Sotheby's.
the flat surface with a circular aperture, the stone a mottled green tone suffused with opaque dark-russet areas.
Sotheby's. Important Chinese Art, London, 06 Nov 2019