It's hard to tell the exact grade from the photos, but I would say your coin is at least AU-50-- I see a very strong LIBERTY and all 4 diamonds. You might want to check your coin against these coins in the PCGS Photograde Guide: http://www.pcgs.com/photograde/#/Indian/Grades
The only think I can tell from the pictures is it looks AU. The glare off the coin and the dark color can make it look worse than it is. I also when I expanded the obverse it looked like a little green spot of verdigris on the lips.
The reason I say this, I have a indian head someone gave me that looks the same, and I always thought it had those problems. Altered as in the color of the coin doesn't look good to me. For an AU coin I think it should be lighter brown