Very nice LUFKIN No. 863L Boxwood & Brass Rule with Spirit Level.     Measures 8 inches long when folded, and 24 inches unfolded, 3-fold.     Has the spirit level in the center leg.      Made around 1945 or so.   LUFKIN originally imported their boxwood rules from Europe, after World War one they started making their own.      In very good condition for its age, a very nice different rule for the collection.     If you require any further information or more pictures, just yell out.      Check out my other vintage tools l have for sale.