I'll go for MS62 because I see some slight black fingerprints on one side of the coin... I guess those are oil from skin?
OK, the time is up for guesses. I have submitted the coin to ICG and the result will actually come back within 4 weeks, perhaps much sooner. It has been given an approximate grade of MS63 or MS64 by ICG. I thought they'd slab it at the coin show, but instead I will have to wait for them to mail it back to me. I will announce the winner as soon as I get the coin back, and I will post a photo of the coin in the slab.
Oh nice! It's too bad that you have to wait up to four weeks to get it back, would have been nice if they could have slabbed it there!