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<p>[QUOTE=&quot;tommyc03, post: 3205365, member: 17665&quot;]Mint marks used to be hand punched, not any longer or since 1989 so it is impossible to have an RPM after that date. There is no such thing as a flawless coin on a business strike made for general commerce. Even an MS70 coin may have a minute flaw. Mechanical doubling which is flat and shelf like happens when a die bounces or there is play in the coining chamber. These are not errors. Doubled dies are an error or variety if you wish, caused by a flaw on the die. These appear raised, not flat and may includes notches. Doubled dies have a premium but mechanical doubled coins do not. You can collect them if you want but they are worth only face value. A good read on all of these topics can be had by exploring <a href="http://www.doubleddie.com" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.doubleddie.com" rel="nofollow">www.doubleddie.com</a>. John Wexler&#039;s site covers many topics including all I have mentioned. There is a wealth of free info there and hours of reading. As for &quot;what the hell are we all doing this for&quot;? Too learn and educate ourselves and sift the chaff from the hay.[/QUOTE]</p><p><br /></p>

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