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<p>[QUOTE=&quot;World Colonial, post: 2460724, member: 78153&quot;]The 16-d is a &quot;key&quot; date in all grades.&nbsp; I suppose the 21 and 21-d might be to Mercury dime collectors (that&#039;s how I used to think of it) but I don&#039;t believe those who don&#039;t collect the series think so in equal proportion.</p><p><br /></p><p>I suspect there are proportionately a large number of collectors who speculate in key dates, including the 16-d, who do not collect the series.&nbsp; Also, per my prior post, I don&#039;t believe the PCGS estimates for the 21 and 21-d are remotely accurate.[/QUOTE]</p><p><br /></p>

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