A very dark patination should only affect the grade of a coin at the MS levels when the toning is so heavy that it impairs luster. The patina of your coin is exactly what you should expect on a 100 year old average circ coin that has not been messed with previously. There might be a lump of crud adhered to the right side of the wreath but other than that, acetone would have no effect.
Thanks for the info, this was just an example, I have a coin in sight, but it is very dark. But I need it to complete a type set and I don't want to overpay.
the best thing you can do is shop around and compare prices, look around online and at other coin shops, good luck and I'm sure you will find your coin. I spend way to much time in a coin shop if I go in, and spend too much money by the time I leave.
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