Catalogue entry no. 509 by Max Loehr:
509 Ornate Oval Plaque
Greenish gray, dark brown, and russet jade. The slightly plano-convex plaque is decorated in relief on the upper side and by engraving on the underside. The relief décor, composed symmetrically along the main axis, shows masks without contours, whose curved eyebrows resemble bovine horns. Split body bands with claw-like feet undulate toward the sides, terminating in fluted curls. The bands are smooth, but their movement is accentuated by grooves running close to the inner curves. The ground is set off against these smooth bands by exceedingly fine cross-hatching. On the reverse side is an engraved pattern of rhombic fields with alternating geometric fillings framed by an oval border with curls and criss-crossed leaf-shaped elements. There are seven perforations along the perimeter. Late Eastern Chou.