Thought I was plenty clear, The coin is slabbed as "genuine". Initially I was a bit confused and upset by getting this, but I am a proof collector and was really only interested in the reverse proof anyway. I didn't much care that the modern bullion coin was labeled that way because I don't collect modern coins and I could always throw it into my silver rounds and forget about it. I have to be honest though, if I would have known how high this set would skyrocket, I would have made more of a stink about it. But I think that my complaint would have been with the mint for poor packaging anyway. The rubs on the coin could be confused with cleaning and I don't disagree with NGC for seeing it that way. As it has been mentioned before, the graders are not the ones that unpack the mail. My point was that it is hard sometimes to know why TPGs reject coins for grading. At least it is for me.
That was my first thought, then I saw that post on counterfeits and, at least, the slab sez it is genuine. I saw a bunch more just today that were graded "details" because of corrosion. Wonder if these could be conserved/cleaned?
Usually corrosion means the coin is done. Almost all surface corrosion is bad enough it will leave marks on the underlying metal. Same with toning if allowed to go too far. Coins that can be conserved are usually coins with other surface contaminants that removal of should not affect the underlying metal.
I have found ANACS the most "merciful" of the leading grading services on coins with slight problems--they will usually straight grade coins that NGC will details grade, and of course PCGS will details grade coins too, but less likely.