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<p>[QUOTE=&quot;mikediamond, post: 131896, member: 1859&quot;]I&#039;ve seen this form of doubling on many copper-plated zinc cents.&nbsp; It is incuse doubling, which distinguishes it from typical machine doubling.&nbsp; I have seen incuse doubling on a few state quarters and in those cases it appears to be an unsual form of die deterioration doubling.&nbsp; The incuse doubling on zinc cents is seen quite frequently in conjunction with the formation of raised &quot;ridge rings&quot;, which is also a manifestation of die fatigue.&nbsp; The totality of the evidence thus points to this incuse doubling as a form of die deterioration doubling.[/QUOTE]</p><p><br /></p>

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