I've never graded a Proof coin, but I'm trying to learn how to grade them. With the angle used to take the image I almost cannot see much imperfection. Would you be willing to share pictures with your phone being parallel to the coin. I think that angle would give us more information to work with.
A nick on O (one), and MD on reverse. Probably will be 65+ to 66. Yes those PR are nicer 's for that era, in fact 1956 till1959 are really nice. To find in 68 it is a challenge and almost for DCAM red.