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<p>[QUOTE=&quot;mikediamond, post: 1147042, member: 1859&quot;]The 2009-P dime appears to have been struck on an improperly annealed planchet.&nbsp; Excessive heat, prolonged exposure to heat, or excessive oxygen in the normally oxygen-depleted environment of the annealing oven causes copper and nickel atoms in the clad layer to migrate and segregate out into relatively uniform layers.&nbsp; Copper tends to migrate toward the surface.[/QUOTE]</p><p><br /></p>

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