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<p>[QUOTE=&quot;dreamer94, post: 292684, member: 6449&quot;]Several discussions here have mentioned that slabs for certified coins are not air-tight.&nbsp; I would assume that a copper cent that is certified as RD could change to RB or BN if not stored properly.&nbsp; Has anyone seen this happen?&nbsp; I have seen a few slabbed coins from (PCGS and NGC) that are certified as RD that either look brown or have blotches of brown color on a red background.[/QUOTE]</p><p><br /></p>

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