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<p>[QUOTE=&quot;LaCointessa, post: 3438709, member: 87186&quot;]I went looking and my preliminary research shows:</p><p><br /></p><p>&quot;Occluded gas bubbles should not be confused with blistered plating, the latter being an affliction restricted to copper-plated zinc cents.&quot; </p><p><a href="http://www.error-ref.com/gas-bubbles/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/gas-bubbles/" rel="nofollow">http://www.error-ref.com/gas-bubbles/</a></p><p><br /></p><p>That same website instructs that &quot;By definition, occluded gas bubbles are generally restricted to solid-alloy issues.&quot;&nbsp; Is it because the 1964 quarter is only 90% silver, it is a solid-alloy issue? I will be reading more about this.</p><p><br /></p><p>So much to learn.[/QUOTE]</p><p><br /></p>

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