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<p>[QUOTE=&quot;Insider, post: 5213481, member: 24314&quot;]AFAIK all the major TPGS have good slabs.&nbsp; I know for sure that both NGC and PCGS spent ton&#039;s of money perfecting the slab materials they use.&nbsp; I&#039;ve heard (check this out) that both those services get slab &quot;parts&quot; from Chinese companies.&nbsp; Perhaps that makes their holder more subject to counterfeiting. </p><p><br /></p><p>Coins can change in a holder over time.&nbsp; PCI SE are the best example.&nbsp; Contamination may occur when the coins are slabbed or it may be something that the submitter did to the coin before sending it in.[/QUOTE]</p><p><br /></p>

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