I normally would never have looked twice at this thing since it looked like your basic strap wrench handle. But, since it had a patent date I looked for it in DATAMP, very much to my surprise it wasn't listed. It turned up on Google Patents rather quickly.
The patent was issued to a William Love of Bryn Mar, PA on June 3rd of 1902. No. 701,489.
Overall length is 11 1/4 in. It appears to be cast iron and not a forging.
I'm not exactly sure, but this may have been the patent for the very first strap wrench, since Mr. Love doesn't make any mention of prior designs. It sure looks like most of the current day designs.
Unfortunately, the strap is MIA.
Link to patent is below.
https://patentimages.storage.googleapis.com/pdfs/US701489.pdfMike