B58-746 COMBINATION SQUARE AND BEVEL. Halsted & Ackerman. The earliest patented combination square and bevel, patented in 1855, with a fold-out bevel blade in the brass handle. This one has only a 4" blade and 3-1/2" handle which is a size we've never seen. It's also marked with the patent date which is unusual. Modest tarnish but no rust, user name stamped on handle. Good+ 200-400