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<p>[QUOTE=&quot;messydesk, post: 2520594, member: 1765&quot;]I would say that if you have two groups of coins, one graded 25 years ago, one graded yesterday, and the old group hasn&#039;t been culled for upgrades, and you crack out and resubmit all the coins for grading, those cracked from old holders will more likely grade differently from those cracked from new holders.&nbsp; This is simply a reflection of the fact that market grading standards evolve over time.&nbsp; If half of those grading differently go up in grade, then more of the older ones will go up in grade (half of the larger number is still greater than half of the smaller number).&nbsp; </p><p><br /></p><p>The evolution doesn&#039;t necessarily manifest itself as a linear shift in grades from one time to another, and is typically far more complex.&nbsp; A 1991-graded Morgan dollar might typically grade the same today unless it was graded DMPL, in which case many of the DMPL coins would lose that designation.&nbsp; Meanwhile, an old XF $5 Liberty may have a great shot at AU, while an old MS61 might as well.[/QUOTE]</p><p><br /></p>

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