I am going to go out a limb and call this MS-64, Red. I've seen better date (e.g. 1869)
Indian cents like this come back with "R&B" designations when the coin had be obviously dipped, but had not turned pink. That might be the case here, but appears to have an original look to it. There are too many marks in the field and the face to grade any higher than MS-64.