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<p>[QUOTE=&quot;Conder101, post: 802900, member: 66&quot;]In 1985 they first included the S mintmark on the model for making the master hubs for the proof coins.&nbsp; Between 1986 and 1990 they began doing the same thing to the models for the master hubs of the circulation coins, one denomination per year.&nbsp; I don&#039;t know what order they did the denominations but the cent was the last one changed over and it was in 1990.&nbsp; (Considering the shear number of dies that had to be mintmarks by hand you would think they would have changed the cent over FIRST.)&nbsp; This is also why the &quot;Phantom D&quot; cents started showing up in the 1990&#039;s.&nbsp; Rather than make three models for the cent, a S, a D, and one with no mintmark, they just made the first two.&nbsp; Then they would take the master hub for the D cents and make the Master dies for Denver.&nbsp; When they were finished they would grind the D off the master hub and then use it to make the Philadelphia Master dies.&nbsp; In theory the polishing the Master die and the working dies receive should have remoed any lingering traces of the grinding, but in some cases traces of the original D mintmark would still show up.&nbsp; This tended to happen most often on the cents in the mint sets due to their higher pressure striking.</p><p><br /></p><p>Finally the Mint began using three models and the &quot;phantom D&#039;s&quot; stopped.&nbsp; (There was even one year that the grinding traces remained strong enough that the curves crated by the spinning grinder gave the appearance of a &quot;phantom S&quot;. But the &quot;S&quot; was the wrong size and in the wrong location to have come from the S master hub.)[/QUOTE]</p><p><br /></p>

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