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<p>[QUOTE=&quot;illini420, post: 1215387, member: 19423&quot;]Not sure how much extra it would cost, but sealing the coin 100% air/water tight in a holder would not only seal in the coin, but also seal in whatver air/moisture was inside the slab with the coin.&nbsp; I don&#039;t remember everything from high school science, but I&#039;m thinking this could cause problems when shipping the coins or bringing them from hot/cold environments as it would then be possible for moisture to condensate on the inside of the slab and maybe even cause damage to the coin.&nbsp; By not sealing the holder air/water tight, this problem is avoided.&nbsp; I imagine the problem could also be avoided by not only sealing the slab air/water tight but also vacuum sealing the coin.&nbsp; that would be expensive.[/QUOTE]</p><p><br /></p>

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