A 1920s book on plumbing lists it as a hole reamer for lead pipe. It seems lead pipe did not come with elbows, unions or joints, one made what they needed on site. Then the pieces were joined and soldered, or (wiped) to seal. Also called a lead pipe reamer in the Antique Tools and Machinery book by HC Wendell. The wrench with multi openings/jaws sure looks like early farm machinery or tractor, there are hundreds of variations and makers.