This is a good clean special purpose 1/2" size offset wrench with a free spinning crank knob at the other end. It is marked "PAT.....MADE IN U.S.A." It is rust free with some pitting noted, in useable condition, the spinning head turns so smoothly we wonder if it is ball bearing. It is obviously made for assembly of a part the is about 8" diameter exterior, with nuts or bolts in the center, most likely automotive, but could be for a machine. It measures 9.5" long overall, with a 1/2" socket firmly attached. The end of socket to throat clearence is 2.25". Center to center of the swing arm end to the throat is 3". Not a wrench you see everyday most likely.