AU details is my grade as well. It looks like it was cleaned some time ago and has started to re-tone.
I agree that it is AU, but I'm not convinced it was cleaned. I see no evidence of that on the reverse, at least. The obverse pictures are too blown-out to really see much. Can you try re-taking the obverse pictures?
Okay, now I see the cleaning on the obverse. AU details. If you got it for a good price, still a decent coin.
I too am unison concerning the grade. I’ll add though. It appears to be exceptionally well struck. I am a bit smitten by this one. Beautiful coin.