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<p>[QUOTE=&quot;physics-fan3.14, post: 3273245, member: 19165&quot;]I&#039;ve gone through some collections from old-timers that were built in the 1950s. These guys had put brand new wheat cents in 2x2s when they came out. The cardboard was a bit yellowed with age, the mylar was brittle, but the 2x2s were still intact and the coins were in pristine condition. </p><p><br /></p><p>I see no need to change out your 2x2s, unless you start to see a problem. Things to look for would be if you see any pinholes in the plastic, you want to change that because you&#039;ll get uneven toning around that hole. Also, inspect carefully to see if any foreign material was trapped in the 2x2 (a hair, a piece of dust or lint, etc). If you leave those in there, they will start to damage the coin. To avoid these problems, whenever I put a coin in a 2x2 I shoot a small shot of compressed air at the coin and holder to clear out any dust.[/QUOTE]</p><p><br /></p>

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