Nice looking coin...that's how they should look after all these years. Out of my expertise, but I venture EF.
Reverse roughness would have me net grade the coin, and it would not surprise me if it were in a details holder. That said, I guessed a silent net grade of XF 40.
I went with the XF Details both due to the reverse porosity and the color which to my eyes looked a little too even for a circulated coin. Not my specialty by any means, but its my guess. Chris