Beautiful coin! I'm a huge fan of this series and its $5 counterpart. The incuse design makes it bit harder to judge - I wouldn't be surprised by anything between AU55 to MS63. Ultimately, I think MS62. @Santinidollar that's a copper spot on the obverse? Before I saw your response, I assumed it was the shadow of a scuff on the NGC holder... could've fooled me.
I know. Very difficult. I have the complete set with a strong D, all raw and purchased many years ago. I tried to get them close but there's only one way to know for sure about the grade.