The second set is most likely factory. Parker Overload Proof barrels are post order book period so no order book record of such gun or barrel installation would exist. It still sounds like a great gun. Google has a wealth of information on Belknap Hardware and some neat pictures of their facilities. At one time, Belknap had a complex of 37 buildings to house their business as well as a massive high rise building that is referred to as a "warehouse" in the pictures.
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