Catalogue entry no. 102 by Max Loehr:
102 Collared Disk
Large disk with a low collar around the inner edge. The jade is of a soft green hue, with calcified areas which have turned white and opaque. On both sides of the disk are incised, circular grooves, grouped in four concentric bands and separated by slight furrows. Most uncommon is the following phenomenon: visible on the upper side of the disk, within the substance of the jade itself, is a lei-wen pattern, not originally part of the décor, which in all likelihood is the result of a chemical reaction with a textile in which the disk was wrapped. Shang or Western Chou.