The owner of the camera I saw said that the vignetting never showed on his pictures, though in truth he's a collector more than a photographer, I think.
In a related story: at the recent PHSNE Photographica, I was convinced to take a 4x5 RB off the hands of another dealer at a low cost ($50) that I then turned around and gave to another dealer because I had too many projects. It had a
way big flange for the lens mount that was pretty obviously factory installed in that it wasn't attached to the front but was the main front standard of the camera, welded in as all of them are. And there was no flip-up door, no broken hinge or place where one had been. I mean the threaded opening was well over 75mm. In looking up the Big Bertha last night, I found that the Graflex site has a few pictures of 4x5 versions made by the factory with 20" Wollensak telephoto lenses.
Here is a George Eastman House page on one. I wonder if the one I passed on was a body from one of these.
Turns out the other projects I bought (5x7 and 8x10 view camera bodies that need work) are less likely to be interesting in the long run than the one that got away... I guess it works out like that sometimes.
Whitey