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<p>[QUOTE="BadThad, post: 7537027, member: 17261"]The giant machines that roll out the metal into a sheet get dirty over time and impregnate impurities into the metal. This cannot be seen when the planchets are cleaned and processed. It only manifests as the coin ages and tones creating "roller lines". It is mostly seen on the 1981 and 1982 copper cents.[/QUOTE]</p><p><br /></p>
[QUOTE="BadThad, post: 7537027, member: 17261"]The giant machines that roll out the metal into a sheet get dirty over time and impregnate impurities into the metal. This cannot be seen when the planchets are cleaned and processed. It only manifests as the coin ages and tones creating "roller lines". It is mostly seen on the 1981 and 1982 copper cents.[/QUOTE]
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