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<p>[QUOTE=&quot;cladking, post: 158459, member: 68&quot;]The &#039;68 to &#039;98 sets can&#039;t usually be opened cleanly as Conder101 said but there is a small percentage that can and those busting them in quantities could make use of this.&nbsp; There is evidence that&#039;s left behind though so you could spot these if they ever became popular (I&#039;ve never seen one).&nbsp; Where the plastic was sealed it will turn white when opened.&nbsp; It&#039;s possible this white could be polished out.&nbsp; The &#039;68 set is particularly tough to open but dates like 1972 are often a breeze.&nbsp; </p><p><br /></p><p>Proof coins are legal tender and can circulate but rarely for long.&nbsp; I found a &#039;68 proof quarter worn down to VG a few years back.&nbsp; </p><p><br /></p><p>The proof set market is subject to the same forces as other coins;&nbsp; supply and demand.[/QUOTE]</p><p><br /></p>

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