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<p>[QUOTE=&quot;Mac McDonald, post: 7822383, member: 117420&quot;]Sounds like you haven&#039;t had these...or proof sets from that era...for long, and if you don&#039;t know how they&#039;ve been stored by previous owners and/or subjected to, if not well, it could be problematic, esp if cells are not intact.&nbsp; That said, if none of the others/other coins besides those you mentioned are having any issues and you can store them in a cool dry, non-contaminate place, I&#039;d monitor them regularly for a while...at least once monthly.&nbsp; I have dozens from that era of flat-paks and few (coins) out of all of them have any major issues of spots or toning. I know the 36-55 box sets had an issue with the OGP plastics, but don&#039;t believe the flat paks of 55-64 did...a definite improvement in materials. If possible, I&#039;d keep them in the original cello/flat paks...I&#039;d pay more for them as sets if they were, and you can never go back...but that&#039;s me.&nbsp; To each their own.[/QUOTE]</p><p><br /></p>

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