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<p>[QUOTE=&quot;Hobo, post: 531076, member: 11521&quot;]Think of machine doubling this way - - - the dies come together to strike the planchet between them. A moment after the coin is struck the dies start to pull apart and one &quot;chatters&quot; (moves slightly). The sideways motion of this &quot;chattering&quot; die shears off a portion of the raised portions of the just struck coin. This is what causes the &quot;terraced&quot; look. </p><p>&nbsp;</p><p>Machine doubling is not an error. As daggarjon noted, machine doubling does not increase the value of a coin and in some cases may decrease a coin&#039;s value.[/QUOTE]</p><p><br /></p>

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