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<p>[QUOTE=&quot;SanMiguel, post: 76833, member: 3379&quot;]a mule error note is quite rare and valuable, but they are usually referred to as double denomination errors. generally, when someone refers to a mule in banknote terms they&#039;re usually talking about something a little different, but with the same front/back difference principle. </p><p><br /></p><p>the back of the note is different from the standard authorized issue, and the only way to tell is if you know which specific backplate number is supposed to go with what front. this usually happens when the front printing plate is replaced, but the reverse plate from the older print is still used for a short time before it gets replaced as well. too complicated and discerning for my tastes, so i don&#039;t really care for them.[/QUOTE]</p><p><br /></p>

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