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<p>[QUOTE=&quot;E Pluribus Unum, post: 2518946, member: 74265&quot;]Please excuse my ignorance as I do not have any error coins in my collection and I have never seen one except in photos.&nbsp; What is the difference between machine or mechanical doubling and double stamped?&nbsp; I know that there is a 1955 &quot;double die obverse&quot; which costs a pretty penny.&nbsp; I don&#039;t know the mechanism that causes the double die, but I assumed that the coin was struck twice.&nbsp; However, if this were the case, then would not both sides of the coin appear as a double die?[/QUOTE]</p><p><br /></p>

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