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<p>[QUOTE=&quot;yakpoo, post: 7743353, member: 18157&quot;]Ignorance is Bliss! I have no dog in this fight since I&#039;ve never looked into it. Based solely on the link you provide, it says...</p><p><br /></p><p>&quot;Roller marks are <b>parallel incuse lines</b> that are formed on the metal surface of the coin during processing at the Mint.&quot;</p><p><br /></p><p>&quot;If any tiny little piece of stray matter gets onto the ingot or the rollers, (such as little shavings of metal, or dirt or sand,) the incredible pressure from the force exerted by the rollers <b>will cause the foreign matter to carve fine lines or grooves into the sheet of coin metal.</b>&quot;</p><p><br /></p><p>&quot;Long, Straight, and Parallel Lines - There are a few other events which can happen in the mint that will cause similar looking damage to the coin planchet, but roller lines can be distinguished from these other types of damage by the fact that <b>roller lines are straight and parallel.</b>&quot;</p><p><br /></p><p>&quot;Another diagnostic for confirming roller marks are that they will go underneath (<b>and sometimes across</b>) the devices on the coin and continue on the other side.&quot;</p><p><br /></p><p>&quot;when the coin is struck <b>the lines are usually obliterated by the devices rising from the surface of the planchet during striking.</b> The roller marks on the field area of the coin are often still present because the force of the strike wasn&#039;t enough to obliterate them. Large coins are more difficult to strike well, which is why <b>roller marks are far more common on large coins</b> such as Silver Dollars, than they are on smaller coins like Seated Dimes.&quot;</p><p><br /></p><p>This is what I get from the article...</p><p><br /></p><p>1. Roller lines are incused.</p><p>2. Roller lines are more likely seen on fields than on devices, but not always.</p><p>3. Roller lines are more common on larger coins.</p><p><br /></p><p>I&#039;m hearing arguments for/against these being roller lines...but likely roller lines.</p><p><br /></p><p>Either way, they&#039;re both Mint errors. Does this help? <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie5" alt=":confused:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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