This a very clean used inside caliper that is marked "THE LUFKIN RULE CO. SAGINAW MICH. MADE IN U.S.A.". It measures 8" long from the center line of the pivot joint to the tips. It is in very good working order, good clean threaded rod, and solid nut, very good pivot joint, the spring is still strong. There is no rust, some minor stained spot, no damage. A quality made tool, by a well known maker!