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<p>[QUOTE=&quot;mikediamond, post: 36330, member: 1859&quot;]There are at least six causes for an apparent &quot;double rim&quot;.&nbsp; For otherwise normal quarters, the three chief causes are:</p><p><br /></p><p>1. Slight horizontal misalignment of the obverse (hammer) die.&nbsp; Coin metal fills the rim gutter of the die (producing an &quot;inner rim&quot;) and also squeezes laterally into the gap between die neck and collar, producing an &quot;outer rim&quot;).&nbsp; The &quot;inner rim&quot; is the true design rim.</p><p><br /></p><p>2. Collar clash.&nbsp; The die hits the top of the collar and/or scrapes along the working face of the collar.&nbsp; This damages the rim gutter so that the top or edge of the design rim shows serrations from contact with the ridges on the working face of the collar.</p><p><br /></p><p>3. Finning.&nbsp; Excessive overall striking pressure, or increased localized striking pressure due to slight die tilt, can cause coin metal to extrude into the narrow gap between die neck and collar.[/QUOTE]</p><p><br /></p>

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