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<p>[QUOTE=&quot;Bill in Burl, post: 3094362, member: 23692&quot;]Machine (or mechanical) doubling is not actually made in the striking process.&nbsp; Once the die hits the planchet, the coin has been &quot;struck&quot;.&nbsp; In the microseconds after the strike, the die starts to lift away from the planchet and slightly rotates or moves as it rises away.... that is machine or mechanical doubling.&nbsp; It has nothing to do with the die or the planchet .. it is from a loose key/lock/retainer holding the die in the retainer.&nbsp; Tighten it up and the &quot;doubling&quot; stops.&nbsp; In Herbert&#039;s books, you won&#039;t even find MD in the &quot;striking&quot; portion of the book.[/QUOTE]</p><p><br /></p>

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