Post clear pictures of the barrel flats, (the bottom of the breech of the barrels). There will be a marking there that will clarify the type of barrel steel. Parker Steel is the type of fluid steel that was usually used on PH grade Parkers later than the manufacture date of your gun. Your gun is listed as a Twist Steel barrelled gun in the Serialization Book, a book whose contents are derived from the Parker Brothers stock books.
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