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<p>[QUOTE=&quot;Coinchemistry 2012, post: 2085570, member: 28107&quot;]On very scarce or rare pieces it can give you an idea of what is out there (but tends to err on the high side for some issues that are targets for crack out operations).&nbsp; For instance, I collect designated cameo Liberty Walking Half Dollars.&nbsp; PCGS and NGC have only certified 17 of these for the entire series.&nbsp; Given that these are worth large premiums, I would argue that virtually all of them are certified.&nbsp; So I can say that there are approximately 17 at most out there, with the possibility that there are fewer.&nbsp; This tells me a lot about how difficult these are to find and why these do not trade hands very often.[/QUOTE]</p><p><br /></p>

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