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<p>[QUOTE=&quot;mikediamond, post: 65662, member: 1859&quot;]It&#039;s an example of &quot;sintered plating&quot; or &quot;copper wash&quot;.&nbsp; An unintended, thin layer of copper was deposited on the planchet prior to the strike.&nbsp; The origin of the copper is controversial and poorly understood.&nbsp; Folks trace it either to the annealing drum (sintered plating) or the chemical rinse bath (copper wash).&nbsp; Neither explanation accomodates the full range of variation seen in these coins.&nbsp; In any case, accidental copper plating goes back at least to the late 1950&#039;s and continues up to the present day.&nbsp; Some of these coins have merely a copper hue, while others have thick plating that&#039;s cracking and peeling.&nbsp; These simply represent the ends of an unbroken continuum.[/QUOTE]</p><p><br /></p>

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