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<p>[QUOTE=&quot;mikediamond, post: 4306330, member: 1859&quot;]You are correct that the same kind of hardened black crud found embedded in the 1959-D and 1970-D cents is the same material responsible for dropped fillings.&nbsp; You are also correct that this &quot;die fill&quot; or &quot;grease&quot; shows varying degrees of hardness and coarseness.&nbsp; So it&#039;s more tarry in the 1959-D cent and grittier in the 1970-D cent.&nbsp; While dropped fillings and clash marks both leave behind incuse, mirror-image design elements on the coin, there&#039;s seldom any difficulty in distinguishing between the two errors.&nbsp; And these aren&#039;t the only sources of incuse, mirror-image design elements.&nbsp; But this discussion really should be assigned to a new thread.[/QUOTE]</p><p><br /></p>

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