Knowing RLM's this is probably a 66,, but i went 65 and didn't give a +1 because it looks a bit dirty on the rev,, and I'm unsure if that is a hit in the filed to the right of abe's face or not,, but if it is, then that's another knock that holds it at 65 vs. 66.....
I am not too sure what to say about this one. I have MS67's that have more nicks than this coin, but they have great luster and bright clean color. This one has neither. I have no idea how much this counts, but I have seen many 1951-S's and nearly every one has this same muted luster. Even thought the spotting is not as obvious in hand, it is most definitely there. I think I would have guessed a 65, but PCGS said 66.
Now there are 9 with scores under 0.50, but baha still leading. Top 10. Columns are rank, name, average, and number of guesses. bahabully 0.250 50 ldhair 0.304 25 Leadfoot 0.311 47 swhuck 0.346 28 BadThad 0.354 50 jallengomez 0.367 32 Duke Kavanaugh 0.368 20 Coinguy56 0.412 18 mark_h 0.426 49 ddoomm1 0.611 19