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I think the cancel is a forgery.
I wouldn't know, no experience in this area, however, I always feel unease when I see a perfectly inked Postmark, perfectly positioned socked on the nose, it's just "too nice", indeed it could be genuine, but I always treat these with caution.
The concentric rings look a little dodgy too. If the hammer was Brass or steel, I cannot see that smudgy shape appearing.