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<p>[QUOTE=&quot;mrh757, post: 61100, member: 2998&quot;]My guess is that the coins have been exposed to heat-fire damage.&nbsp; when a clad coin is exposed to high heat they tend to bubble up. I think it is because copper melts and a gas forms under the nickel but I am not a chemist so wait for an expert to answer for sure.[/QUOTE]</p><p><br /></p>

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