Catalogue entry no. 207 by Max Loehr:
207 Thin Trapezoidal Knife
Blackish brown jade, turning deep gold-brown at the translucent edges of this astonishingly thin blade. Both the back and the sharpened lower edge are curved. The lateral edges are straight and, like the lower or cutting edge, sharpened, being ground from the upper side only. Parallel to the back are three equidistant perforations, all drilled from the same side. Western Chou(?).