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<p>[QUOTE=&quot;John Burgess, post: 8171878, member: 105098&quot;]yeah there is that possibly. Denver had Graebner MK 360 presses from 1986-2001</p><p>they both use Schuler MRH since then.</p><p><br /></p><p>there&#039;s an altitude and air pressure difference between Philly and Denver, and there is operator differences in the settings also that could be a factor.</p><p><br /></p><p>This was also the period of time the Denver Mint added the visitor center from 1980s until 1992 when it opened,&nbsp; entrance on Cherokee St. maybe....</p><p><br /></p><p>The zinc used in the U.S. one cent coin comes from the Tennessee Valley Mines, it&#039;s a close knit group of mining companies and processors in a small area in Tennessee. just the one source.&nbsp; the Copper comes from Morenci mine in Arizona.</p><p>Jarden Zinc produces the cent blanks, for both Philly and Denver.</p><p><br /></p><p>I don&#039;t think there&#039;s any &quot;planchet production&quot; difference both zinc and copper for both mints come from the same places, and one manufacturer of blanks, Jarden Inc. does the sheeting and plating...</p><p>However, I don&#039;t know if this was always the case, like early on the mint may have tried a couple vendors and settled on jarden in 1990-1992 for the best product and may have had a blank producer west of the Mississippi River in the early days of the Zincolns.</p><p><br /></p><p>I haven&#039;t dug further because I&#039;m not writing a book on it. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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