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<p>[QUOTE=&quot;justafarmer, post: 3048959, member: 3926&quot;]Doubled Dies are created during the die manufacturing process - Mechanical Doubling is created during the coin striking (coin manufacturing) process. </p><p><br /></p><p>The OP&#039;s coin is a 1970-S. At this time the Mint in a separate independent process added Mintmarks by punching them by hand using a mallet and steel punch into finished dies one at a time (individually).&nbsp; </p><p><br /></p><p>The OP&#039;s coin is showing identical doubling in both the Mintmark and the Date. But the Mintmark and the Date were added to the die in two separate independent pocesses in the manufacture of the die.</p><p><br /></p><p>So if you think about it - the most logical step for creating this identical doubling would be the coin striking (manufacturing) process - Mechanical Doubling.[/QUOTE]</p><p><br /></p>

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