Catalogue entry no. 350 by Max Loehr:
350 Serrate Disk
Small disk with evenly spaced, rectangular, and sharply cut serrations at the outer and inner edges (12 and 9, respectively). The surfaces are decorated with an engraved pattern of spirals, which are arranged radially and concentrically rather than in straight rows or grids, as in the late and more common design of embossed spirals. A measure of angularity in, and occasional interlocking of, these spirals likewise suggests a relative early date. The originally translucent, soft green jade is strongly calcified and in part has withered away. Early (?) Eastern Chou.