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<p>[QUOTE=&quot;dog_pound, post: 2750322, member: 77895&quot;]I believe it is filled MM, caused In some cases by small die break in others a deteriorated die, or a&nbsp; well used and deteriorated mint Mark punch.&nbsp; The mints hand punched MM&#039;s into working dies until mid 1980.&nbsp; There are several well known S mint marks types from 1979 and 1981 type I &amp; type II which do carry a premium if type II</p><p><br /></p><p>This is a common occurance and worth very little if anything as an error AND in some cases not an error at all. </p><p>By PSD were you referring to post strike damage?&nbsp; If so I would say No[/QUOTE]</p><p><br /></p>

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