Catalogue entry no. 246 by Max Loehr:
246 Demon Face
Light yellowish green jade with decomposed white streaks. The mask is carved out in thread relief lines from a concave piece of stone with a vertical crest down the middle. The eyes have the shape characteristic of Shang or Western Chou zoomorphs; the nose is almost flat; the mouth bares rows of squarish teeth and log fangs. Instead of earlobes there are small perforated disks. The forehead rises to an obtuse point, and beyond the eyes expands into flamboyantly outlined wing-shapes. The back is left plain. Probably early Western Chou.