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<p>[QUOTE=&quot;rlm&#039;s cents, post: 1902078, member: 7957&quot;]Lincoln are not copper plated zinc.&nbsp; If the plating separates from the zinc it results in the &quot;bubbles&quot;.&nbsp; Bubbles are easy to see versus contact marks.&nbsp; Bubbles are just that.&nbsp; That means they are raised.&nbsp; Many can actually be pushed down and in essence popped.&nbsp; Contact marks are all indented .[/QUOTE]</p><p><br /></p>

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