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Show me a 66 with a fingerprint, in a slab, and I'll laugh in your face.
I really, really agree with that. Not sure how many times I've seen coins with a finger print on at a coin show and just couldn't sell unless the price was rock bottom.
In one instance I found a 1995 Doubled Die
Lincoln Cent with a large print right on the face. It was what could have been MS-65 or better. I got it for $10 and thought I either was a jerk or smart. At home I soaked it in Acetone and the finger print must have been new because it came off completely.
This doesn't work for finger prints on a coin that has been there for a long time. Acetone will not even dent a long time in place finger print.
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I've recently found a bunch of older pennies that look great, but have some fingerprints on them - don't know whether to keep them or even if I should be excited about finding them.
I suggest at least giving them a chance with some acetone. If nothing happens, you would be out only about $4 or $5 for the Acetone. Just remember that saying OLD doesn't mean that even without the print, still might be just a ordinary, plain coin.
IF your planning on just placing them back in circulation, still try some other things and let us know how you did.