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<p>[QUOTE=&quot;physics-fan3.14, post: 3146642, member: 19165&quot;]Sets with matching toning are worth more because they appear to be original. </p><p><br /></p><p>Unopened sets are worth much more because the potential for toning is exceptional. </p><p><br /></p><p>Some years are known for producing ridiculously attractive toned examples, and these sets are worth a premium. </p><p><br /></p><p>When you talk about plastic or mylar sets, those don&#039;t produce toned coins, and they were made in very large quantities. </p><p><br /></p><p>So, its a combination of the OGP (Original Government Paper) being scarce, and the fact that many of these sets were well toned.[/QUOTE]</p><p><br /></p>

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