B59-576 LEVEL. Federal Level Co. Federal Level of Chicago produced a whole series of lighted levels in the beginning of the twentieth century based on Daniel Frank's 1912 patent, but this is the version before they started putting light bulbs in which is actually rarer. Porthole level and plumb, with a sight in the top to allow the user to access the level vial, and Federal's distinctive magnifying porthole covers. 24" long, super clean, with a "union made" label. From the collection of Don Rosebrook. Fine 80-150