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<p>[QUOTE=&quot;GDJMSP, post: 4901328, member: 112&quot;]Is it ? What folks should learn from this is that sometimes, maybe even a lot of times, there just isn&#039;t any definitive answer as to how marks got there or what caused them. The best you do is guess.</p><p><br /></p><p><br /></p><p><br /></p><p>It could have easily been caused while the planchet strip was being rolled out. But debris embedded in the rollers ? I doubt that seeing as how they are hardened steel. But fine debris falling onto the stirp as it runs through the machine ? Given the nature of rolling mills - all kinds of which can be seen here&nbsp; <a href="https://www.google.ca/search?q=rolling+mill+machine&amp;lr=&amp;sa=X&amp;as_qdr=all&amp;tbm=isch&amp;source=iu&amp;ictx=1&amp;fir=Y9E6KiI6DS537M%252CkL44T_wmvR_oyM%252C_&amp;vet=1&amp;usg=AI4_-kSoeqhSdqtz-byy4dqj-C_apwK7fw&amp;ved=2ahUKEwj51szD0pPsAhVFTt8KHaQcBMUQ9QF6BAgDEF0#imgrc=Y9E6KiI6DS537M" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.google.ca/search?q=rolling+mill+machine&amp;lr=&amp;sa=X&amp;as_qdr=all&amp;tbm=isch&amp;source=iu&amp;ictx=1&amp;fir=Y9E6KiI6DS537M%252CkL44T_wmvR_oyM%252C_&amp;vet=1&amp;usg=AI4_-kSoeqhSdqtz-byy4dqj-C_apwK7fw&amp;ved=2ahUKEwj51szD0pPsAhVFTt8KHaQcBMUQ9QF6BAgDEF0#imgrc=Y9E6KiI6DS537M" rel="nofollow">https://www.google.ca/search?q=rolling+mill+machine&amp;lr=&amp;sa=X&amp;as_qdr=all&amp;tbm=isch&amp;source=iu&amp;ictx=1&amp;fir=Y9E6KiI6DS537M%2CkL44T_wmvR_oyM%2C_&amp;vet=1&amp;usg=AI4_-kSoeqhSdqtz-byy4dqj-C_apwK7fw&amp;ved=2ahUKEwj51szD0pPsAhVFTt8KHaQcBMUQ9QF6BAgDEF0#imgrc=Y9E6KiI6DS537M</a>&nbsp; &nbsp; - I&#039;d guess that would be almost an hourly occurrence.</p><p><br /></p><p>And the various things that &quot;can happen&quot; in a rolling mill, the sheer number of them can boggle the mind. Several different examples, and some similar to what Insider posted, can be seen here -</p><p><a href="https://www.coinworld.com/news/precious-metals/error-originates-in-the-rolling-mill-collectors-clearinghouse.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.coinworld.com/news/precious-metals/error-originates-in-the-rolling-mill-collectors-clearinghouse.html" rel="nofollow">https://www.coinworld.com/news/precious-metals/error-originates-in-the-rolling-mill-collectors-clearinghouse.html</a></p><p><br /></p><p>And even more extreme examples here -</p><p><a href="http://www.error-ref.com/rolling-mill-errors-rolling-indentation/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/rolling-mill-errors-rolling-indentation/" rel="nofollow">http://www.error-ref.com/rolling-mill-errors-rolling-indentation/</a></p><p><br /></p><p>But all of this is only one of many, many possibilities as to how the marks occurred and what caused them.[/QUOTE]</p><p><br /></p>

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