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<p>[QUOTE=&quot;iGradeMS70, post: 1237947, member: 29109&quot;]Preparation of a proof striking usually involved <a href="http://www.cointalk.com/wiki/Polishing" class="internalLink ProxyLink" data-proxy-href="http://www.cointalk.com/wiki/Polishing">polishing</a> of the dies. They can usually be distinguished from normal circulation coins by their sharper <a href="http://www.cointalk.com/wiki/Rim_(coin)" class="internalLink ProxyLink" data-proxy-href="http://www.cointalk.com/wiki/Rim_(coin)">rims</a> and design, as well as much smoother &quot;fields&quot; - the blank areas not part of the coin&#039;s design.</p><p>The dies for making modern proof coins are often treated with chemicals to make certain parts of the design take on a <a href="http://www.cointalk.com/wiki/Frost" class="internalLink ProxyLink" data-proxy-href="http://www.cointalk.com/wiki/Frost">frosted</a> appearance, with the polished fields taking on a mirror finish. Several other methods have been used in the past to achieve this effect, including sand blasting the dies, and matte proofs. Proof coins of the early 19th century even appear to be scratched, but it was part of the production process.</p><p>Most proof coins are double struck. This does not normally result in doubling that is readily observable, but does result in the devices being struck fully.</p><p><br /></p><p>... Definition of &quot;proof coinage&quot; via Wikipedia. Sadly, It mentions nothing about the coins being struck in high relief. Good luck in this &quot;argument&quot;. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>-Brian[/QUOTE]</p><p><br /></p>

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