While I have no first hand experience with trying this, my first thought when looking at the picture was someone holding a soldering iron to it. Especially the fine tips used for small solder cup wiring. Again, I have never tried it so I don't know what the results would be. Is this in a TPG holder?
I took it from a proof set myself and put it in a Whitman holder, just in case it was corrosion, so I know that wasn't it. But it'd be interesting to know what a soldering iron would do to a coin.
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