Catalogue entry no. 106 by Max Loehr:
106 Notched, Serrate Disk
Translucent, evenly gray-green jade. Sturdy disk with three deep notches and three sets of serrations on the arc between the notches. The wide perforation was originally biconical, but was ground smooth after drilling, The edges of the perimeter, too, have been smoothed. Shang or Western Chou.