You have a 'solid black finish with freckling' - and that's straight off the internet.
The originals had that too, you just got a lot of 'freckling' - you lucky bastard
Never seen a 'case hardened' barrel, or even a pretend 'cased' finish on a barrel, or even a B/A reciever come to that - but those slab sided actions often got 'tarted up' with them - so I expect it might be cosmetic.
And 'johnduxbury' might have got it right - might be nickel steel which can make it difficult to apply a quick 'finish'.
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