B65-567 SIGHTING LEVEL. Lockwood Patent. These sighting levels, with a diagonal mirror so the user can sight through the top rail, show up often enough to be classified as uncommon rather than rare, and for a long time their maker was a mystery, as they invariably have a paper label that is either completely illegible or marked simply "Patent Applied For." Finally an advertising flyer turned up revealing that they were patented by one Charles Lockwood in 1892 and marketed as the "Straight Line" level by Lockwood Brothers of Rochester. They came in various lengths, this one is 12", the wood is clean, the label is, as always, illegible, and the optics are good. From the collection of David Jeffers. Good+ 100-200