Catalogue entry no. 218 by Max Loehr:
218 Trapezoidal Knife
Light brown, highly translucent stone with dark brown markings. The blade has a straight back and cutting edge. Along the back are two strongly conical holes, set far apart. A hole of the same kind and size was drilled from the reverse side along the median axis, just beyond the hole to the left. The faces slope gradually to the cutting edge without being beveled. On both sides of the blade remain scars of a rotating or swinging saw. Western Chou(?).