OWL Pipe Wrench

[Danks]

My Brother inlaw gave me this wrench yesterday that he obtained at a garage sale. It is 18' long and the only markings on the wrench are  "18" & "OWL".
The adjustable jaw appears to have been ground down to a slimmer profile. It also appears to be a copy of "Alphonse Brungardt's Jun. 07, 1932 US Patent No 1,862,002" that was manufactured by Walworth of Boston MA. Any information as to the manufacturer of this wrench would be greatly appreciated. Cheers