Gold is not my specialty. But knowing that gold is softer and shows hits much easier than silver, my guess for this one would be a strong 64 shot 65 so, 64+. It looks to have very nice glowing luster and looks pretty clean.
65 due to the spot on the headdress, the mark behind the Indian, and whatever is going on near E PLURIBUS UNUM.
If that's not a hairline across the Indian's cheek, I'm in the 66 camp as well . . . otherwise 65+ . . . VERY NICE COIN.
Booming luster! Congratulations, this is an outstanding gold coin. I am late to the show, but would have guessed MS65. Maybe you want to resubmit it one day...? ;-)