Catalogue entry no. 230 by Max Loehr:
230 Yüan Disk
Thin disk with a wide perforation, fashioned of translucent, evenly pale green jade with a few brown markings and a radial crack. Conical bore-hole. Two slight ridges on the underside, which are not completely ground down, still reveal the process of sawing the slab out of the original boulder. Western Chou(?).