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<p>[QUOTE=&quot;Tom Maringer, post: 177558, member: 7033&quot;]We call that &quot;overstriking&quot;. When you can still see the design of the coin used for the planchet it&#039;s called an &#039;undertype&#039;. The goal is usually to conceal the undertype, though some folks enjoy leaving enough of it to identify. </p><p><br /></p><p>Basically... making coin blanks (or planchets) is a very large part of any minting operation. If the coin you want to make can use an existing commonly available coin as the blank, then it is often easiest to do that because then someone else has assumed the task of maintaining alloy and weight control. Eliminating the original design is the trickiest part. Flattening the coin as you suggest would work... but modern coins are so thin already that you seldom have the luxury of giving up any of that thicknes.</p><p><br /></p><p>The more usual method is to anneal the coins in a furnace, then use rolling drums, like rock-tumblers, with abrasive media to clean up all the toning and oxide skin. If the coin is annealed a bright it should overstrike cleanly.[/QUOTE]</p><p><br /></p>

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