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<p>[QUOTE=&quot;Arizona Jack, post: 286126, member: 9308&quot;]&quot; Spark erosion &quot; I believe refers to what machinists call EDM- Electrical Discharge Machining. I have several of them in my shop / day job. A female version of the coin in either carbon or copper could be cast from a genuine, then used as an electrode. This technology has been around since the 40&#039;s, but these days it&#039;s scary accurate</p><p>&nbsp;</p><p>Doug.. I meant Ebay policy on copys[/QUOTE]</p><p><br /></p>

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