Catalogue entry no. 211 by Max Loehr:
211 Thin Trapezoidal Knife with a Cutout
Black and blackish green stone blade of plano-convex shape, with a sharp and slightly battered, curved cutting edge. The two lateral edges are also sharpened. Along the straight back there are three perforations, which appear to be cylindrical. A fourth and smaller perforation is placed farther left, along the median axis. Beyond this smaller hole, there is a beautifully curved cutout at the back of the blade. Early Western Chou(?).