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<p>[QUOTE=&quot;ddddd, post: 3245485, member: 22377&quot;]It&#039;s not a mechanical error as PCGS didn&#039;t always use the &quot;SP&quot; designation. Up to a point they only used &quot;MS&quot; but then they decided to switch over (likely due to the rise in &quot;specimen&quot; coins like the 2005-2010 Mint sets and the various burnished silver, gold, and platinum coins starting in 2006). NGC also switched over to using SP (although they continue to use MS for the SMS coins-with a notation of SMS on the holder).</p><p><br /></p><p><br /></p><p>Here is a similar question from the PCGS forum:</p><p><a href="https://forums.collectors.com/discussion/920576/1967-kennedy-sms-proof-questions-ms-vs-sp" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://forums.collectors.com/discussion/920576/1967-kennedy-sms-proof-questions-ms-vs-sp" rel="nofollow">https://forums.collectors.com/discussion/920576/1967-kennedy-sms-proof-questions-ms-vs-sp</a>[/QUOTE]</p><p><br /></p>

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