I would sure want to see the letter from Jacks son Bradford before I would ever consider bidding on this gun. There's simply too much BS clutter in the description & posted text from a book that sets off my BS detector, including the non-matching serial numbers of the barrel sets.
Then I question, if a gun like this does have the provenance background of being owned by a famous writer like Jack O'Connor. Why is it on GB rather than at one of the top auction houses that attract top tier buyers of such things.
So far this isn't passing my smell test.