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<p>[QUOTE=&quot;COCollector, post: 3050651, member: 76108&quot;]I&#039;ll never again buy a 70-grade modern silver coin.</p><p><br /></p><p>3 years ago I bought a PF70 reverse-proof 2015 Canadian Maple. It <i><b>was</b></i> beautiful. Sadly, it developed minor spotting and significant hazing around the rim.</p><p><br /></p><p>Today I&#039;d be lucky if it grades PF69. For sure I wouldn&#039;t buy it.</p><p><br /></p><p>TPGs recognize this deterioration problem. And they don&#039;t guarantee that a graded coin will retain its grade.</p><p><br /></p><p>For example: &quot;<a href="https://www.pcgs.com/guarantee" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.pcgs.com/guarantee" rel="nofollow">The PCGS Guarantee</a> does not apply to coins exhibiting environmental deterioration subsequent to PCGS grading and encapsulation. This deterioration may include, but is not limited to, spotting, hazing, PVC contamination, changes in color, and corrosion.&quot;</p><p><br /></p><p>Interestingly, I&#039;ve had great success preserving a roll of Maples in Air-Tites. After 3 years, only a few developed minor spotting. Most are still as pristine as new -- and much nicer than my PF70.</p><p><img src="https://i.imgur.com/ivs4ozu.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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