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<p>[QUOTE=&quot;Oldhoopster, post: 7929563, member: 84179&quot;]Prior to 1989, the mm was individually stamped into each working die (the die used to strike coins).&nbsp; Since then, it&#039;s added upstream in the die making process (I can&#039;t recall if it&#039;s the working hub or master die step).</p><p><br /></p><p>Die deterioration is caused by abrasion/erosion due to the moving metal of tens of thousands of coins.&nbsp; Here is some more info explaining DDD from Wexler&#039;s site.</p><p><br /></p><p><a href="https://www.doubleddie.com/144801.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.doubleddie.com/144801.html" rel="nofollow">https://www.doubleddie.com/144801.html</a>[/QUOTE]</p><p><br /></p>

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