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<p>[QUOTE=&quot;longnine009, post: 2682280, member: 1886&quot;]&quot;...There are two ways of describing die progressions. The first focuses on die wear. The description of the wear has been termed &#039;die state&#039; by Delma Romines, the developer of the theory...&quot;</p><p><br /></p><p>&quot;...The theory behind &#039;die stage&#039; progressions has seen several revisions through the years. The general theory begins like this: When a die is first placed in use, it is perfect, that is free from &#039;tear.&#039; Then as a die is used, it developes imperfections that grow steadily worse and worse until the die has to be pulled from the production line. These imperfections consist mainly of die clashes, die cracks, and die breaks...&quot;</p><p><br /></p><p>The RPM Book Second Edition Lincoln Cents by James Wile, PhD. pgs iv &amp;v[/QUOTE]</p><p><br /></p>

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