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<p>[QUOTE=&quot;desertgem, post: 1534901, member: 15199&quot;]Corrosion.&nbsp; Government sealing/packaging is not air tight and over time, environmental sulfides and moisture can enter and react. Mint sets are often collected and put away without noticing such until they get too heavy to stabalize.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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