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<p>[QUOTE=&quot;desertgem, post: 1134736, member: 15199&quot;]Before the time of single squeeze working die formation, and the date for that varies according to denomination and source, the practice was to press the hub die and the working die together at least 2 times, and there had to be annealing and preparation done between each time to soften the working die before the next press. The dies have tabs so that they should &quot;always&quot; line up correctly, but sometimes they don&#039;t, and a second press is not exactly into the first impression, so you have a doubled image on the working die</p><p><br /></p><p><a href="http://www.coinresource.com/articles/doubled_dies.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.coinresource.com/articles/doubled_dies.htm" rel="nofollow">http://www.coinresource.com/articles/doubled_dies.htm</a>&nbsp; describes the different types of doubling that can be produced as there are also doubling from using different hub dies for the 2nd strike, and one can be distorted ,&nbsp; a slightly different design or a completely different design hub producing such coins as the 1960D/D DDO where a large date die was used for one impression and a small date die for the other.</p><p><br /></p><p>Doubled dies from single squeeze production should be impossible, but they aren&#039;t and many mechanisms have been proposed to explain them.&nbsp; I am sure others can add or subtract from my answers.</p><p><br /></p><p>Machine doubling is not due to the die being doubled, but mainly from malfunction of the die holders, to hold and align the dies correctly, so in the process of striking, there is movement other than vertical that can create the damage by affecting the details of the coin. </p><p><br /></p><p><a href="http://koinpro.tripod.com/Articles/OtherFormsOfDoubling.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://koinpro.tripod.com/Articles/OtherFormsOfDoubling.htm" rel="nofollow">http://koinpro.tripod.com/Articles/OtherFormsOfDoubling.htm</a></p><p><br /></p><p>and this url describes them well.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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