Dear DrewDavid from Maine,
    It would be interesting to see how that gun cleaned up after being submitted to a good wirebrushing and crosschiselling.
  IF IT MEASURES WITHIN THE PRESCRIBED DIMENSIONS AS LAID DOWN WITHIN THE RULES OF PROOF,  legally it is permissable to sell it and / or shoot it.
   It looks rough at the moment but who knows how it will clean up.
   Many a gun that is now the pride and joy of a Yankee started off in much worse condition than that.
 'Caveat Emptor' but nothing ventured  nothing will be gained.
  TLC for TLC
Tender Loving Care for The Loose Cannon