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<p>[QUOTE=&quot;cladking, post: 1623054, member: 68&quot;]I do not believe this is likely the same thing.&nbsp; I&#039;m not certain what it is because &quot;burnishing&quot; which is done to many planchets including both mint set and proofs uses spherical &quot;ball bearings&quot;.&nbsp; It&#039;s entirely possible this has changed or this is related to a different process.&nbsp; While the surfaces could get uneven they tend to be polished more than eroded.&nbsp; </p><p><br /></p><p>I know nothing about the machine supposedly in operation to bang up regular issue planchets but it seems more likely they&#039;d be tumbled with odd shaped steel.&nbsp; If you look at an incomplete strike you can see how scatches disa[ppear under the strike.&nbsp; These scratches don&#039;t look like they came from the process you describe.</p><p><br /></p><p><img src="http://t3.gstatic.com/images?q=tbn:ANd9GcSTD4jIGLjoRI5sDoVMwwpX_71rvgTkxlAe01sT3uOdHXtQpUcY" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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