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<p>[QUOTE=&quot;johnmilton, post: 24492570, member: 101855&quot;]The old flat Pack Proof set holders from mid 1955 to 1964 did a surprising good job at preserving the coins. The problems come from having the sets jammed into a small space or stacking large numbers of them on top of each other. If the knife rims on the Proof coins cut the plastic, air could get in. </p><p><br /></p><p>Another problem has to do with storage in an attic, basement or garage. Extreme heat, cold and moisture are not good. </p><p><br /></p><p>I think that Proof singles from this era are an expensive purchase unless you are looking for two sided Cameo Proof coins. I much prefer complete Proof sets. But maybe that&#039;s just me.[/QUOTE]</p><p><br /></p>

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