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<p>[QUOTE=&quot;messydesk, post: 2384938, member: 1765&quot;]With the exception of ultra-rarities where each specimen can be traced, the survivorship numbers are estimates based on research done by specialists in the series who have a really good feeling for this.&nbsp; For some of the more common dates where hoards are not known the estimate is probably just a fixed fraction of the original mintage that represents standard attrition from a certain point in time.[/QUOTE]</p><p><br /></p>

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