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I'm at NT. I'll guess it was once in some type of plastic holder with a cardboard gasket.
Acetone is not going to help you. It's not going to brighten the coin.
Great find. Nice surfaces and color. That's the look that collectors will step up and pay for.
I went with 66+. It has that look to me. Very few hits with nice luster.
Folks like you here. You are always friendly even when you get bad news about a coin. You keep your cool and learn from it. Not many new members...
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