The older Wingmaster's were superbly made. Mine is a 20 gauge made in 1952. Many people, including me consider the 870's of that era as the best of the best of the pumps. I would not hesitate to buy that gun for $400. Too bad it was reblued, but mechanically it should be sweet if it was not abused.
Strive to live up to the opinion that your dog has of you.