You talking about just to the right of the "R" in Dollar? I saw that and it struck me as being a scratch on the plastic.
I thought they might let this one go due to it being on the reverse and not in focal area. Dropped 1point. Curious to find out. Much MD there also (letters)
I with MS63. Weak date (die deterioration) and several smallish hits throughout. The mint luster is good though, so I could understand MS64. But, in my opinion, Standing Lib collectors, especially in MS, want as strong of dates as possible (I would) and I assume the professional graders grade them with same/similar standards. All that said, nice coin and a date that's quite scarce in original VF-EF condition (which is the preferred grade range for my collection).
I voted details due to the scratch/damage on the reverse through the rim and E in Quarter Otherwise I think it would have received a nice UNC grade.
The relatively wide, deep damage at the reverse rim appears to possibly be a knife cut, which puts it in Details territory imho. Otherwise, it’s a nice coin. Edit: these are observations from 70 year old eyes...hope I’m wrong.