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<p>[QUOTE=&quot;cwtokenman, post: 139615, member: 2100&quot;]On 11FE03, NGC announced that it would begin to guarantee grades on copper, bronze, and copper-nickel coins for a time of 10 calendar years from the date of the NGC grading. before that, there was no grade guarantee for those coins. Of course coins slabbed prior could be submitted for reholdering.</p><p><br /></p><p>Clicking on the &quot;PCGS Guarantee&quot; link on their site only lead to some rather vague verbage that I could see being taken to mean either way that they would guarantee or not guarantee the color.</p><p><br /></p><p>Anacs grade guarantee applies as per their line: &quot;This Guarantee applies only to ANACS-graded platinum, gold and silver coins.&quot;</p><p><br /></p><p><br /></p><p><br /></p><p>My opinion is that the tpgs do not seem overly confident in the medium to long term protection afforded by their slabs for grades of copper, bronze, and copper-nickel coins, so it may be mostly wishful thinking that such slabbed coins will retain their color indefinitely. It may well be conducive for color retention for the coin to be slabbed, but evidentally results are not favorable enough to offer a long term guarantee. Some other methods, such as intercept shields may offer better protection.[/QUOTE]</p><p><br /></p>

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