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<p>[QUOTE=&quot;satootoko, post: 114534, member: 669&quot;]For many years working dies were produced without mintmarks, and after a particular die was designated for a mint other than Philadelphia, the mark was put on the die by hand, using a hammer and punch.&nbsp; A error of the &quot;X over y&quot; type occured when a die had been punched for one mint and when it was decided to use it at a different mint the new punch was applied over the old one.</p><p><br /></p><p>The same principle explains RPMs, which resulted when the punch moved slightly between multiple hammer blows, or was applied a second time and didn&#039;t align perfectly.</p><p><br /></p><p>Coins having X/Ys or RPMs were struck that way in the first instance, not struck, ejected, reinserted in the die, and struck again.[/QUOTE]</p><p><br /></p>

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