Manufactured by the John Roberts Company, historically known for producing scholastic jewelry, class rings, and military insignia Features a complete sequence of heavy alloy sizing rings with marked increments (7, 7½, 8, 8½, 9, 9½, 10, 10½, 11, 11½, 12, 12½) The inner lid includes technical guidelines specifying how different weight designations (“M”, “L”, “XH”, “CB”) correspond to fit tightness