Really what difference does it make? If all the parts are original and correct, no one will know in the future who assembled it. It is not like old guns that are reassembled with mismatching serial numbers.
I agree Tom, in my opinion, if a person is replacing broken, worn or lost parts, with original used parts for the same make and model, then aren't we actually restoring a trap? Now, if we were to put Newhouse jaws and posts on a Sargent, or a Newhouse or P.S.& W style chain on a Nisbit trap and then claim it is original, that would be cobbling, in my opinion. Antiques of every type are restored with original parts every day of the year, but they aren't considered cobbled or counterfeit,
they have been restored.
But again, this is my opinion!