Nice find. To clean up the barrels, soak Kano Kroil on the barrels and some 000 fine steel wool to clean up the brown / rust on the exterior. I bet you will get some black / white finish when you're done.
Looking at the pictures, it looks like some deep pitting near the breech to the exterior of the barrels. If you ever decide to restore the Damascus, Brad Balchelder is your man. He can fix that and you will never know there was ever a repair there. Call him and he will explain how he does it. The man is a Master.
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