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<p>[QUOTE=&quot;davidh, post: 2866822, member: 15062&quot;]You would think it would be an easy question but I haven&#039;t been able to find a definitive answer.</p><p><br /></p><p>Coin sizes are almost always given in millimeters, e.g., a Cent has a diameter of 19mm.&nbsp; However, when the size was originally codified it was 0.75&quot;.&nbsp;&nbsp; It actually still is 0.75&quot;, with the 19mm being a close approximation (actually 19.05mm).</p><p><br /></p><p>Likewise, the Nickel, designed with a diameter of 0.835&quot; is now designated with a diameter of 21.21mm.</p><p><br /></p><p>So, when did we (the mint) officially go from inches to millimeters as size designation?[/QUOTE]</p><p><br /></p>

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