AU58 the coin is quite nice and I think original color. This coin could be market graded at 62 like many have guessed I can see the coin in either grade.
Ah, but your pic showed what appeared to be wear marks on the knee! I can't believe some folks said it was "details," though.
To me the images make a details grade look very possible. The lack of luster in the images made this one almost impossible to guess. I would have guessed AU-55.
I would have to say AU59, even though such a grade is unofficial. It looks like just a trace of friction wear on a few high points.