Hi, my name is Mike and I've just got back into coin collecting...I try and collect as much pcgs and ngc high grade coins as i can afford, but i also would like to fill my Morgan Dollar books up with "raw" coins...Everything has been going along smoothly and i feel i have been getting some decent deals on yahoo and ebay...Today I received a AU 1886-S which i have attached the link to. For some reason, the s mint mark to me doesn't appear to match the rest of the coin...I have looked at it close and there are no marks around it and no halo effect except on the left side. The mark seems "dirtier" than the rest of the coin. Anyway, what is the best way to determine if it is authentic....will acetone cause it to drop off if it has been added? also what role does acetone play in collecting and where can i buy it...i know it probably comes in fingernail polish remover...can that be used?
Coin in question:
http://page.auctions.shopping.yahoo....7?aucview=0x70 
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