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Howdy Mike - Welcome to the Forum !!
Based on the pic you provide there is no way anyone can tell if the mint mark is added or not. And there really is no way this can be confirmed or not except by someone knowledgeable in the field. You can look for tool marks in the area or signs of glue residue but if you are not familiar with these you likely wouldn't know it if you saw it. I would suggest having someone who does know examine the coin in person.
As for acetone - I would certainly not suggest that one who is inexperienced with using it use it at all. I know many collectors feel it is harmless to coins. There are however many other knowledgeable people who do not share this thinking. Acetone will definitely harm copper coins for example. And since nearly all US coins have at least a small percentage of copper in them - well you get the idea. Dipping, soaking or attempting to clean or conserve coins in anything is best left to the experts.
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