209 Heavy Trapezoidal Knife
Black stone with a dark gray band and faint grayish markings. The back is straight and shows a longitudinal groove left from sawing the raw slab. The lateral edges, which create a strongly tapering profile, are rounded. The slightly concave shape of the cutting edge is unusual; double-beveled, it is ground thinner than the rest of the blade and is set off by a marked step. Western Chou(?).