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<p>[QUOTE=&quot;Clawcoins, post: 8526467, member: 77814&quot;]think of those webpages as very stringent rules.</p><p><br /></p><p>A 1972 - 001, etc is very specific to a certain run of a reverse and an obverse die set on even a particular machine for a short time.&nbsp; It&#039;s not even all 1972 cents, nor all from the same mint which has multiple machines running at the same time.&nbsp; It has no relation to any other year, or other mints or even other dies (look at the die numbers for the 1972s) which may have a life span of just a few days before being replaced. Of course that does not take in to account Die Deterioration, or loose equipment (mechanical doubling), etc. or at what level a doubling may have been made.</p><p><br /></p><p>If each &quot;error&quot; was related to a particular mint and year, then it would just all be the same. Then every 1972 D would have the exact same error, which would make it common and not even worth looking for because it would be on each and every one.</p><p><br /></p><p>So using a 1972 as a reference for a 1991 just doesn&#039;t work, especially when during that time frame the composition and the die manufacturing process was completely changed.&nbsp; The 1982 cent composition and 1986 going to a single squeeze method for dies.&nbsp; and all the issues related to the zinc cents.</p><p><br /></p><p>I think as example, Denver in 2011 could produce about 200 million cents per month, 500k avg 3cents per die side.&nbsp; So that is about 400 dies being used in one month.&nbsp; One press can make about 300k per 8 hour shift.&nbsp; And the mint of course has multiple presses.&nbsp; These numbers are rough taken from reports.&nbsp; Denver currently has about 64 presses of which only about 50 are active .. or something like that.&nbsp; Anyways, that&#039;s a lot of dies of which you are normally looking for a particular cent made from one die (that aren&#039;t scooped out and trashed) for those more rare ones.&nbsp; There&#039;s a lot of variations dependent upon various doubling at what level of die manufacturing.[/QUOTE]</p><p><br /></p>

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