B66-567 LOT OF TWO SIGHTING LEVELS. Lockwood Bros. 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. These are both 12", one has brass end caps and side views on the level vial, label worn and illegible, the other is a simpler construction without the end caps but a brass plaque surrounding the sighting hole, label nearly intact. Good 80-160