The frost is a tad weak IMO. The mirrors are good but could be better, they have some of what I call speckles that are common on Proofs of that age. There's some light black marks, again somewhat common of Proofs from that time. Overall, I dunno 67-68 DCAM probably.
Yeah speckles. They start out as dust I think, but there's lots of different kinds of dust. And some dust, with time, creates little tiny spots, speckles, on Proof coins. Sometimes the dust itself falls off, but it leaves behind the speckles. Sometimes you'll see them in small patches, other times just one or two here and there.
The ones along the smile line behind his mouth, there's one on the lapel of the coat, Monticello has some in the windows and columns.
i think Doug is referring to the small amount of dust that settles on the coins before encapsulation. This dust can be anything from dust from drywall at the mint to tiny particles of skin. Over time, this dust will discolor and mark the coins in non favorable ways. A good example is this 1909 liberty nickle, notice all of the carbon spots that have darkened over the years. This is likely the result of dust on the coin as well as someone breathing on the coin years ago.
Sadly with proof coins, I don't know of any good way of preservation without damaging the extremely delicate mirror fields of the coins. I guess that is one of the main reasons that it is extremely difficult to find high grade proofs with any age.
That brings up a good point. We think of grades as being static, and they are not. Coins change over time, even within the slabs. Ruben
I think you are absolutely correct Ruben. I don't know if coins are somehow treated as a means of conservation by TPGs before slabbing, but I suspect that they are not. That 1909 is a NGC PR-65, but it may be the ugliest 65 that I have ever seen. It may not have been that badly spotted before slabbing twenty years ago, but I would be a bit shocked if it would achieve any more than a PR-63 today. Even taken into account the somewhat lax standards applied today.