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<p>[QUOTE=&quot;desertgem, post: 1150587, member: 15199&quot;]Bruce,</p><p><br /></p><p>Most likely it is mylar film that is on the inside of the cardboard. Mylar is used rather than vinyl for that purpose because it doesn&#039;t stretch and become thinner on the edge of a coin and rip like vinyl. </p><p><br /></p><p>The one thing to watch is that the staples do not begin to rust from moisture in the air, or they could cause toning and possible corrosion. It does usually take years for this to happen, but if you live on the seashore , check every year or so.</p><p><br /></p><p>jim[/QUOTE]</p><p><br /></p>

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