I bought a 1881-s MS-66DMPL last month for 1100 and sold it about a week ago for 1200. I was pleasanty surprised.
I think you may have mis-read what i posted. It says increase $300, not increased to $300, with my original estimate of $200 plus this increase of $300 my estimate is $500. As for graded coins, those are not a part of this discussion, since his coin is raw.