Aw, man, I wish I'd seen this coin before. What a stunning copper.
The photographs are not quite up to a standard which would allow me to express a certain opinion regarding circulation, but the color and details I can see certainly reinforce the impression that this one is as-minted. No worse than AU58, and an absolutely primo example regardless.
The striations you mention are, in fact, on the planchet.
I don't think it's a Proof; this is a big-league scarcity in Proof, and those strikes are known for exactness which isn't present on this coin, especially on the reverse details.
Following my gut? PCGS would grade it AU58, and I would, given the chance, slap the grader for his lack of courage for not calling it MS63.