This is a quality made 36" steel zig zag folding rule in very good useable condition. It is marked "THE LUFKIN RULE COMPANY SAGINAW U.S.A.". When fully unfolded it measures 36 long. It is thinner and more narrow than the much more common No. 1173 model, only .019"  thick steel x .37" wide, yet still strong with very good joints. No rust, no damage, some darkening on the steel, and just a few small areas of very minor pitting noted. A hard to find pocket size folding rule by a very well known quality toolmaker!