My guess is the gun may have been dipped in a vat of a Cosmoline. If so you might have a nice hidden gem underneath that old hardened barrier. If someone hasn’t gone after it with a metal scrapper.
I would proceed slow. Try a test area on the barrel. Use some penetrating oil let it soak in then apply some light heat such as a hair dryer or heat gun.
Google Cosmoline removal also contact Cosmoline for advise if you determine this is what has been applied to the Parker.
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