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<p>[QUOTE=&quot;Pickin and Grinin, post: 2804488, member: 73995&quot;]A Rockwell test would have been performed on the Planchet, therefore the test pieces would show a dimple not a plating blister.</p><p><br /></p><p><a href="http://www.error-ref.com/?s=Rockwell" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/?s=Rockwell" rel="nofollow">http://www.error-ref.com/?s=Rockwell</a></p><p><br /></p><p>It says there are no known examples on us coins. I would bet that if you pushed in the dome shaped bubbles they would collapse, and not be solid underneath.[/QUOTE]</p><p><br /></p>

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