I am posting this because I found another set of Parker barrels with "Made in USA" stamped on them.
Here is another set of barrels stamped "Made in USA" on a Parker 20 advertised on GunsInternational:
It is an A Grade two barrel set and I think the barrels shown in the picture I linked to are what the seller states are the original barrels.
Here is a link to the classified:
http://www.gunsinternational.com/Par...n_id=100306682
Here is an image of of the barrel flats on Mr. Olsen's gun:
