Catalogue entry no. 213 by Max Loehr:
213 Heavy Knife with Concave Cutouts
Mottled gray-green and dark brown stone blade, which represents a typological variant of the trapezoidal knife. It resembles that type in its straight back, the three conical perforations aligned along the back, and the double-beveled cutting edge. The left edge, however, which as not been completely ground into shape, dose not slant, and the right end of the blade has a form all its own. Both at the back and at the cutting edge there are curved cutouts, each with two transverse projections. Beyond these cutouts the blade tapers to a triangular end, which, again, is incompletely finished. The cutouts are reminiscent of knives Nos. 211 and 212, while the transverse ridges are a feature linking this piece to the extraordinary shafted axe, No. 195. Early Western Chou(?).