Thanks for the opinions. Of course, if it was plated, it has major issues.
One thing that I found interesting when I bought it... I didn't know this when I got it, but it came in a Littleton Coin Company envelope from 1982. They sold it originally as MS.
So, when you say AU, what do you see that makes you say so? I look at the cheek and it looks quite clean. The second diamond to the top is weaker, though, but I don't actually see it warn into. One of the obverse photos does show what looks like a scratch of some sort to the left of the bust. I also feel like I have seen a number of coins with this kind of coloring pattern in PCGS/NGC slabs before.
Thanks again.