I don't know why the notches in the choke tube couldn't be filled in by micro welding them. We saw where a member had a barrel repaired at the muzzel so that the damage was unnoticeable.
Anybody who would put screw in chokes in a vintage gun should be castorated with a dull butter knife, but thats just my thought. I passed on a Purdy that was a great deal price wise but it had screw in chokes
The barrels had one of the nicest damascuss patterns I've seen.