I'm not a collector perse'. So, I don't much care except that I'd want some choke.
Btw, the presence of a "keel" means very little to me. It's simply a piece of filler metal to make it easy to fill the triangular void and can be made and installed by anyone. In fact, I dropped and lost the one in my Parker barrels when re-laying the ribs and made another in a few minutes from a piece of square keystock and a disksander. So, if someone can run a propane torch and a disksander, he can put a "keel" in after cutting. It's not conclusive of originality.
