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<p>[QUOTE=&quot;desertgem, post: 4219240, member: 15199&quot;]There is no single answer, there are 8 classes of doubled die action, each with some differences in the areas of the coin being affected. These are in many references .</p><p><a href="http://www.error-ref.com/doubled-dies/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.error-ref.com/doubled-dies/" rel="nofollow">http://www.error-ref.com/doubled-dies/</a></p><p><br /></p><p>So sometimes a large area is affected (&nbsp; type 1) and can be seen with the normal eye, and other times needs a large amount of enlargement and difficult to authenticate ( especially on a circulated or damaged coin.&nbsp; With enough separation, the rounding is easier to see and is usually the main structures of the coins, but for some of the types in small amounts, it is arguable whether it is or not. Generally true doubling enlarges the thickness of the device ( both apparent parts added together, whereas mechanical tends to stay the approximate same thickness when added together.</p><p><br /></p><p>Studying how they can be made ( I recommend the book by Wexler and Flynn~ Authoritative Reference on Lincoln Cents , 2nd) and seeing illustrative examples can help tremendously.</p><p><br /></p><p>Too many people jump in and ask &quot; is this one, is this one, .....etc. and they never find one as they can&#039;t tell the difference. </p><p><br /></p><p>Others use die markers , but a working hub can produce 100s of working dies and many can have the same markers. cracks, scratches, etc; but only 1 was doubled and made doubled die coins.&nbsp; This is usually a killer of desire to find one.</p><p><br /></p><p>This refers to double squeeze dies/coins up to about 1995-8. The new later single squeeze DD coins can&#039;t really be &quot;doubled&quot; die as they only meet once, so the authors call these Class IX &quot;God Only Knows&quot; DD.&nbsp; I am prejudiced that only the double squeeze should be called doubled dies, and others opinions certainly differ, but that is Ok in collecting.&nbsp; Best of luck ,Jim[/QUOTE]</p><p><br /></p>

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