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<p>[QUOTE=&quot;V. Kurt Bellman, post: 3128135, member: 71723&quot;]Yes, environmental damage. But I see the source of your confusion. That 1993-D obviously spent time undisturbed in an environment that could nonetheless &quot;outgas&quot; and affect the surfaces, such as a kraft paper envelope.</p><p><br /></p><p>Whenever I get truly pristine coins in circulation, but not valuable, I try storing them in various sorts of materials, just to observe the differences over the years. Yours looks like &quot;clad coins in kraft paper&quot; to me.</p><p><br /></p><p>So far, hard plastic capsules are the runaway leader in preservation.[/QUOTE]</p><p><br /></p>

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