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<p>[QUOTE=&quot;desertgem, post: 1215408, member: 15199&quot;]Now, they don&#039;t have any concerns about the slab function. If your coin turns bad in one, you are limited to their replacement policy on the coin. If it was advertised that the slab was air tight, whether a vacuum or an inert gas, a failure of the seal could invite serious claims and damages. Filled with an inert gas, a coin shipped by air from long beach or Florida could be exposed to the low air pressure in an unpressurized cargo hold and cause leakage. And how does the owner know it has leaked? Some type of pressure indicator would have to be included within the slab. If a vacuum, a seal damage could suck in whatever air or gas was present. Personally from the physics point of view, I like the current slabs. I can put them into a vacuum ziplock food bag&nbsp; and suck the air out, </p><p><br /></p><p>Since some good AT occurs with the coins in existing slabs, permanent sealing would limit or stop most of it. I am sure the TPGs would like to close this avenue if they thought they could.</p><p>Jim[/QUOTE]</p><p><br /></p>

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