Elmer,
If the question to restore or not is based on increasing the monetary value of the gun then I believe the answer would be don't do it as you would never get your money back. There are some things the average person can do to spruce up a gun but the major work, screws, case colors, restocking would need to be done by a professional to give it a real Parker look.
I attached a picture of a documented factory installed swing swivel. Look to see if it is similar to one or both the swivels on you gun. It's my guess one of the previous owners bought the gun with the swivel already on the barrel but needed it moved for comfort or perhaps a longer strap and had another swivel added. Good luck with your gun.
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