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<p>[QUOTE=&quot;foundinrolls, post: 683943, member: 4350&quot;]Prior to 1990, mint marks were added to individual dies by hand.&nbsp; For 1990 and later coins,&nbsp; in order to make the mint mark more consistent, the D was added to the design right from the beginning phases so that the mint marks were on each hub used to create each die.&nbsp;&nbsp; So from 1990 on,&nbsp; no more repunched mint marks.&nbsp;&nbsp; </p><p><br /></p><p>Single squeeze technology has to do with the making of dies.&nbsp; There is evidence of single squeeze technology being experimented with as far back as the 1980s.&nbsp; </p><p><br /></p><p>On cents though, it was around 1996-1997 that that technology became, more or less the standard.&nbsp; Using that date of 1996-1997 for cents as a reference point,&nbsp; single squeeze means that when a die is made, the hub in a &quot;hubbing press&quot; was squeezed into the blank die steel only once to transfer the raised (in relief) details&nbsp; from the hub and create an incuse (recessed) detailed die.</p><p><br /></p><p>Prior to single squeeze technology,&nbsp; the hub was impressed into the die steel numerous times to bring up the details.&nbsp; </p><p><br /></p><p>There are for example, Quadrupled and Quintupled dies on some Kennedy halves that prove at least four or five impressions of a hub into the die steel.</p><p><br /></p><p>In older days,&nbsp; it may have taken ten or more impressions of a hub into the die steel as was the case with some Morgan Dollars, for example.</p><p><br /></p><p>So &quot;single squeeze&quot;&nbsp; = one impression of the hub into the die blank to create a die.</p><p><br /></p><p>I hope that&#039;s not too fuzzy<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Thanks,</p><p>Bill[/QUOTE]</p><p><br /></p>

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