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<p>[QUOTE=&quot;Billyray, post: 908126, member: 24994&quot;]Ok, in 1955, they used a hub to add the design to a die, then used a punch to add the mintmark. Doubling occurs when the hub leaves 2 separate impressions in the die. you can also have a repunched mintmark when the die is double punched with the mintmark. But since they are added to the die in separate steps, there&#039;s very little chance that they&#039;d be doubled the same amount and direction. as for there being no machine doubling on the reverse, MD occurs after&nbsp; the planchet is struck when the hammer die, always the obverse die, shifts slightly and leaves a stairstep like edge on the design features or when the struck coin sticks to the hammer die and then shifts, leaving the MD on the reverse design.[/QUOTE]</p><p><br /></p>

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