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<p>[QUOTE=&quot;Oldhoopster, post: 8160995, member: 84179&quot;]It&#039;s not an improperly mixed alloy for a couple reasons</p><p><br /></p><p>* an improperly mixed alloy starts with a randomly shaped region in the ingot. </p><p>* these regions get elongated during the rolling process, but since the shapes are random, the areas will still vary in thickness and location.&nbsp; You can see how the shape varies on the 2 examples others have posted</p><p>* your coin has parallel lines of consistent thicknesses.&nbsp; That is increadibly unlikely to occur from a randomly shaped region in the melt.</p><p>* also your coin has similar lines on both sides, yet the outer layers of the clad come from diff feedstock with the copper sandwiched in the middle.&nbsp; Cents and nickels are rolled from 1 ingot which makes it possible for the improperly mixed regions to be visible on both sides</p><p><br /></p><p>A better explanation is that dirty rollers pressed oil/residue just slightly into the surface of the strip.&nbsp; Over time, this contamination can tone differently than the rest of the coin. These have been called roller marks, but traditionally roller marks have defined by sites like error-ref as being slightly recessed due to something adhering to the rollers.&nbsp; That&#039;s why I prefer the term dirty rollers. </p><p><br /></p><p>I believe this is the same mechanism that caused the parallel striations&nbsp; found on some 1979-81 cents that are some think are woodies.[/QUOTE]</p><p><br /></p>

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