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<p>[QUOTE=&quot;GDJMSP, post: 345388, member: 112&quot;]Sackies and President coins have a protective coating (no explanation ever given for what it is exactly) applied to them by the mint in an effort to prevent unsightly toning and spots. But it seldom works.</p><p><br /></p><p>It&#039;s not the quality of the metal, it&#039;s the type of metal - manganese brass. It&#039;s highly reactive.[/QUOTE]</p><p><br /></p>

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