It looks a lot like the old Bill's I have, but could be a different year model than mine.
Bill attached a diamond shaped name plate just about where the center section welded to together, so look close & see if there at least four tiny weld spots where a tag could have been welded in place, but removed now.
Lot of people, would be surprised at who old Bill taught how to build pipes. When you get time, search around for pipe pics & see if you can pick out which pipes shape look like a Bill's pipe.
Years ago Bill's was the pipe to have, then CT came on the scene with their big stinger mid range, then it was bark, grunt & go & everybody behind you trying to figure out how you were doing it.
Neil