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Message:: [QUOTE="Tamaracian, post: 7289250, member: 23122"]The "Black Spots/Staining" looks to me like crud (i.e. a combination of organic and inorganic residue that has come to rest or accumulate on parts of the surface, most notably on older coins in between Denticles, and adjacent to protected areas in the Details, which has taken a set over time) which is almost impossible to remove without using mechanical force--of course you don't want to attempt that with a coin that potentially may be worth $400.  Had the "Residue" been soluble in Acetone and successfully removed in the "Washing Step" the areas under the "Residue" would most likely be lighter in color (due to having been protected from environmental effects for some long period of time) and that would be apparent to any knowledgeable collector or TPG; and would garner a Details Grade-Cleaning.  IMO, if you had submitted the coin as is to a TPG you could get a straight grade of AU50/53/55, or if they're really picky, a Details Grade-Environmental Damage due to the 3 Dark Spots on the Reverse adjacent to TWENTY. Since your intention is to list it on eBay--and since it is a fairly scarce Type Coin in that apparent grade with a nice natural patina with no evidence of having ever been cleaned--you should have no trouble in finding a buyer.  Good luck.[/QUOTE]