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<p>[QUOTE=&quot;nickelman, post: 247006, member: 4633&quot;]RPM Stands for Repunched Mint Mark. Up until the late 80&#039;s mintmarks where punched onto the dies by hand and the dies being very hard often times the mintmark punch needed to be stuck several times in order to get the proper depth. Well if the individual moved the punch slightly between hits then you get a second impression on the die RPM. Some are pretty dramatic and others like the 1943D RPM#9 is very minor.</p><p>&nbsp;Sometimes the individual punched the die with the wrong mintmark and noticed and just picked up the correct mintmark punch and punched over which is called an OMM (Over mint Mark) D/S or S/D.</p><p>&nbsp;Other times the punch was no oriented correctly on the first punch and then moved to the correct possition and completed. These you end up with Over Horizontal or Inverted&nbsp; mint marks.</p><p>&nbsp;With the Jefferson Nickel series there are hundereds documented and new ones being discovered all the time.[/QUOTE]</p><p><br /></p>

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