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<p>[QUOTE=&quot;GDJMSP, post: 1579631, member: 112&quot;]Sure we have the technology. They had the technology to produce, for all intents and purposes, airtight coin holders even 200 years ago. (see below) But the question is can a watertight &amp; airtight (and they are not the same thing, a container can be watertight and yet not be airtight) slab be produced on a cost effective basis, and a practical basis ? </p><p><br /></p><p>Unfortunately, the answer is no.</p><p><br /></p><p><br /></p><p>[ATTACH]218019.vB[/ATTACH]</p><p><br /></p><p>James Watt Jr. of the British Royal Mint produced these special coin holders (said to be airtight) in the early 1800&#039;s for some coins of his own collection. They were made of brass and lined with silver. Those coins remained in those holders until 2002 when they were slabbed by NGC.</p><p><br /></p><p>But imagine the cost, and of course you couldn&#039;t see the coins without opening the holders.[/QUOTE]</p><p><br /></p>

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