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<p>[QUOTE=&quot;NorthKorea, post: 2567158, member: 29643&quot;]Mint packaging during the 70s and 80s were notorious for allowing gassing of coins. The details grade might either be for artificial toned surfaces, environmental damage or possibly damaged rims. There are other things that could be the culprit as well, but those seem the most likely for 1970s Mint sets.[/QUOTE]</p><p><br /></p>

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