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<p>[QUOTE=&quot;iPen, post: 2063111, member: 69760&quot;]ok just read Ken Potter&#039;s explanation. It&#039;s vibrations (like the movements for shock absorption?) that cause doubling. So vibrations cause doubling on the letters and numbers only and not the larger (width and relief) portrait because... the portrait tends to be secured in place by the die while the design elements surrounding the portrait are not as secure, causing the MD from the vibration in the split second the planchet is pressed (first design created, highly secure while in pressed position) and being ejected (relatively loose and shifting/&quot;smearing&quot; occurs) (?). If that&#039;s the case, then I can see how some design elements don&#039;t necessarily have MD, while only just say, the MM has MD.</p><p><br /></p><p>However, I would still think that in such a limited area that MD would be more rare, than say, die deterioration because vibration affects other areas of the planchet equally. Obviously, though, that is not the case.[/QUOTE]</p><p><br /></p>

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