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<p>[QUOTE=&quot;mbogoman, post: 20942853, member: 95843&quot;]Yes, they can appear after slabbing, even many years after slabbing. I had the 2011 Anniversary set with all 5 coins in PR70/MS70. They were stable up until about 2018, then they started spotting, one by one until all had spots. They were kept in a dry, controlled environment and I think all it did was postpone the inevitable. I got rid of all my &quot;special set&quot; and proof ASEs after that and don&#039;t purchase them anymore, unless for a flip.[/QUOTE]</p><p><br /></p>

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