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<p>[QUOTE=&quot;desertgem, post: 578348, member: 15199&quot;]Fishaddict,</p><p>&nbsp;&nbsp;&nbsp; Please reconsider your thought. It is difficult at first to be able to distinguish the different types of Doubled die coins and machine doubling on coins. There are many many more machine doubling coins than true doubled die coins. So any doubling one sees should be considered as machine doubling until it can be ruled out.&nbsp; Most true doubled dies have been documented since there are usually thousands to hundred thousands all the same except for small differences that occur as the die wears. </p><p><br /></p><p>&nbsp;&nbsp;&nbsp; The best indication of mechanical doubling is the flattened surface of the secondary image. Yet notice that in regular coins, the date and letters are not flat topped ( except for some proofs), they have a rounded top. So if the hub did press 2 offsetting images on the working die, they would both be rounded, and about the same depth. Thus if the offset is small, there is usually notching on the devices. The extreme case is like this 1955/55 DDO. Notice how both images are rounded and about the same depth of impression ( same height numbers). If the spread wasn&#039;t so extreme, there would be notching ( LIBERTY).</p><p><img src="http://i455.photobucket.com/albums/qq279/desertgem/55ddOlib.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p><img src="http://i455.photobucket.com/albums/qq279/desertgem/55dd0date.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>Obviously this is a very extreme case, but the indicators will be the same.</p><p><br /></p><p>Here is a jefferson 5 cent piece. Maybe some would first think it was a MD, but notice the split notching at the end of some letter serifs, as well as a more rounded appearance.</p><p><br /></p><p><img src="http://i455.photobucket.com/albums/qq279/desertgem/dec24/dblmonticello2.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>Now here is a harder one. Is this MD or DDO?</p><p><br /></p><p><img src="http://i455.photobucket.com/albums/qq279/desertgem/1909ddob-1.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>It is a 1909 VDB DDO. </p><p><br /></p><p>Don&#039;t give up, it takes a while to develop the eye. A forum is so much faster to develop such, it is like having an expert at your shoulder. If you call every example someone shows a MD, you will be correct 99% of the time. It is the other 1% that makes so many look so carefully.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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