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<p>[QUOTE=&quot;CygnusCC, post: 8461151, member: 120299&quot;]Zooming the image, the larger rings seem to consist of tiny bubbles themselves:</p><p>[ATTACH=full]1499254[/ATTACH]</p><p>Is it possible we&#039;re looking at some sort of concentric ring plating blisters instead of the more common linear blistering on zinc Lincolns?</p><p><br /></p><p>I can find no equivalent image of circles from web searches, but the linear plating blisters example on error-ref shows similar characteristics (made of multiple tiny bubbles):</p><p><br /></p><p>from <a href="https://www.error-ref.com/blisteredplating/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.error-ref.com/blisteredplating/" rel="nofollow">https://www.error-ref.com/blisteredplating/</a></p><p><br /></p><p>specifically:</p><p><a href="https://www.error-ref.com/wp-content/uploads/2013/12/55041234.jpg" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.error-ref.com/wp-content/uploads/2013/12/55041234.jpg" rel="nofollow">https://www.error-ref.com/wp-content/uploads/2013/12/55041234.jpg</a>[/QUOTE]</p><p><br /></p>

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