This is a good used 6" long adjustable wrench marked "DIAMOND CALK HORSESHOE CO. DULUTH MINN U.S.A. 6"  DIAMOND DROP FORGED STEEL" in raised cast lettering. There is some minor wear noted some small dings, but the jaws are in great shape, overall in very good usable condition, with very good jaw alignment, and darkened finish. A nice clean vintage wrench from the early 1920's!