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<p>[QUOTE=&quot;mikediamond, post: 61234, member: 1859&quot;]There are several causes behind a &quot;double rim&quot; effect such as you describe.&nbsp; In an otherwise normal looking coin, a double rim effect can be caused by:</p><p><br /></p><p>1. Slight finning of the rim due excessive striking pressure or die tilt resulting in increased localized striking pressure.</p><p><br /></p><p>2. A slight horizontal misalignment of one or the other die.</p><p><br /></p><p>3. Collar clash.&nbsp; In non-reeded issues, this can leave a sunken margin in the rim gutter, which would translate in the coin as a &quot;double rim&quot;.</p><p><br /></p><p>4. Die fatigue.&nbsp; In zinc cents you can get a false rim (&quot;ridge ring&quot;) just inside the design rim.&nbsp; I&#039;ve not seen this on nickels yet.</p><p><br /></p><p>You can also get a double rim effect in association with a number of errors (e.g. minor broadstrikes, partial collar errors, &quot;wide collar&quot; errors, etc.) , but there&#039;s no need to go down that road.[/QUOTE]</p><p><br /></p>

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