Picked this up at a sale the other day. I've never seen anything like it and thought it was pretty cool. It measures just about 7" long. Stamped "Wolverine" and the patent date. The patent number is 923,420
"This invention relates to tools, and more especially to the handles and shanks of wrenches; and the object of the same is to produce a wrench whose-handle or shank is so constructed and connected with the head as to permit the tool to be used in cramped quarters where those of other shapes could not well be employed."