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<p>[QUOTE=&quot;Lehigh96, post: 470188, member: 15309&quot;]I find it a very rare occurrence for PCGS or NGC to be off by more than one grade.&nbsp; In fact, I believe that a very high percentage of PCGS &amp; NGC graded coins are graded properly.&nbsp; The value of the second opinion is that the chance that the coin is overgraded with two opinions becomes very small.</p><p><br /></p><p>Let&#039;s assume that NGC, PCGS, and CAC are correct in their grade 90% of the time.&nbsp; If an NGC or PCGS coin has a CAC, the chance that one of these coins is incorrectly graded becomes very small.[/QUOTE]</p><p><br /></p>

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