I am certainly not the expert that Michael is, but I see nothing that I would call Shelhamer. Barrel is a mystery I think there should be a full Niedner Marking. Even the Niedners I have seen that were only rebarrel jobs were marked with the Dowagiac address.
If Tom Shelhamer made a stock that he did not like (ie. runovers in the checkering), he would saw thru the offending section and throw the pieces in the closest wood stove.
As far as the dealer in his other auctions he shows an obviously parkerized Colt New Service and claims it unfired.
I am leery of these two guns.