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<p>[QUOTE=&quot;jallengomez, post: 827752, member: 19748&quot;]MD, or mechanical doubling, can and does happen to mint marks of all years.&nbsp; True hub doubling would not effect a mint mark prior to 1990 because the mint marks were added to the dies after they had been hubbed.&nbsp; Notice on the 1969S doubled die how the date shows extremely strong doubling, but the mint mark was not affected:</p><p><br /></p><p><img src="http://i307.photobucket.com/albums/nn311/jag68007/1969_s_ddo_date-596x462.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>Mechanical doubling which happens during the actual striking of the planchet could cause doubling on both the date and the mint mark.</p><p><br /></p><p>Because of this, a mint mark that appears doubled along with the date or other devices can be a great tell-tale sign that it is mechanical doubling versus a true doubled die(prior to 1990).</p><p><br /></p><p>It does get confusing!&nbsp; Hopefully I explained it better this time. :high5:[/QUOTE]</p><p><br /></p>

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