Of particular note - the second picture Heavymetal just posted does show the doubled reverse rim the jeffb flagged. I'd say that's a good sign it is not alarming.
I'm a bit of a fan of that look. Here's one of mine in similar condition for comparison. As an aside, I've owned this one for over 50 years which predates the bulk of the counterfeits. Z
Full disclosure: I think that environmental damage might be the driving factor in the appearance of both of these coins, not any kind of natural toning. My first set of photos were taken after several months of pocket carry with a bunch of clad coinage. This Peace Dollar was absolutely hideous before I tried to 'improve' its appearance. Acetone soaking removed a bit of crust but really didn't help the overall look of the coin. Two or three months of carry with a roll of clad quarters in my pocket softened the darkness to what you see above . One thought on the reverse rim. I could see one possibility of that 'seam' being created in the minting process. if the collar was slightly misaligned leaving a gap, metal could have been forced upward creating a 'fin'. If this raised fin were smashed down and retained (rather than being sheared off), it might create what looks to be a seam on the rim. The overall porosity of the surfaces of the OP's coin could be from either being a cast counterfeit or environmental damage. Photos below show how my 1922 started out. Once the question of authenticity has been satisfied on the OP's coin, I agree, no pricing premium for this type of 'toning.' Z How mine started.