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<p>[QUOTE=&quot;desertgem, post: 785676, member: 15199&quot;]If the storage time is less than a year or so, then you might wish to balance the negatives. Plasticized PVC flips are dangerous in the long term, but in my experience it takes several years of neglect. They are however softer and gentle to the coin edges when sliding might occur if they are being handled in the flip or shipped. Mylar ( non-PVC) flips are very safe, but they are stiffer and harder and can rub the edges of coins, especially square edged proof coins. This might not be a problem if the coin is circulated. They are also more expensive.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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