1899-O 1) Yes, it is unslabbed 2) No, I didn't buy it 3) Dealer calls it a MS63/MS64 4) I do not see any signs of cleaning 5) Greysheet bids:...
Besides that isn't it more like $30 or more to get a coin graded nowadays?
1) What are the accepted reasons for using Acetone in cleaning coins? (they are probably debatable...) 2) Where do you get Acetone?
Counterstamp, transitive verb, to stamp or impress (something already stamped or signed)
One of each mint mark...?
PMD (post-Mint damage) in my opinion. Called a "counterstamp" in the old days, probably still is.
Separate names with a comma.