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<p>[QUOTE=&quot;900fine, post: 740373, member: 6036&quot;]If it&#039;s that obvious and irrefutable, the owner should call &#039;em on their guarantee.</p><p>&nbsp;</p><p>I encourage folks to check the latest Heritage auction for the upcoming Houston sale. One finds many very valuable coins - copper, nickel, silver, and gold - in PCGS Genuine holders - marked cleaned, etc.</p><p>&nbsp;</p><p>Recently, on a thread about an Indian $2.5, I cautioned everyone to beware cleaned coins in full-grade slabs - even from reputable dealers. I&#039;m not saying there are no cleaned coins in slabs.</p><p>&nbsp;</p><p>I am saying the &quot;key date bias&quot; isn&#039;t as strong as some think. It is less likely to cover problems than it is to bump a coin a numerical grade. I believe that to be true. Again - check major auctions. 100% chance one will find many valuable coins in problem slabs - the &quot;key date bias&quot; didn&#039;t save &#039;em.</p><p>&nbsp;</p><p>Does a valuable coin have a higher percentage chance of escaping problem status ? Maybe - but again - not as much as some think IMO. If TPGs get called on it, they have a bigger liability.</p><p>&nbsp;</p><p>Let&#039;s beware of &quot;black and white&quot; thinking. It&#039;s a continuum - a sliding scale. Likelihood and probabilities. Exceptions don&#039;t prove the rule; <b>beware of a few examples leading us to go beyond the data</b>. And very few of us, if any, have rigorously analyzed a broad enough sample to come up with a defendable Scientific Method conclusion. Myself included.</p><p>&nbsp;</p><p>IOW - it&#039;s my impression and nothing more. An opinion only, not Scientific Method. Others are welcome to their opinions.[/QUOTE]</p><p><br /></p>

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