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<p>[QUOTE=&quot;jcakcoin, post: 1327212, member: 29209&quot;](Most of this is my personal opinion, not fact)</p><p><br /></p><p>2000 cents were made at Philadelphia and Denver. </p><p><br /></p><p>As always, Philadelphia <b>cents </b>do not have a mintmark. Every other denomination minted has a P mintmark (nickels, dimes, etc) since 1979.</p><p><br /></p><p>If there is a weakly struck date, it is normally struck through grease (which means exactly that). It is an error, but it doesn&#039;t have much value. Personally, I wouldn&#039;t get it certified.</p><p><br /></p><p>You may know this, but Zincolns are zinc with a VERY small layer of copper. Therefore, the layer can come off with minor difficulty. That green stuff you are talking about is known as vertigris, which I believe is oxidized copper, which can be present regardless if the zinc is showing</p><p><br /></p><p>95% of the time when you see an &quot;off-center&quot; coin, it&#039;s just that one area of the strike moves slightly towards the edge, making one rim look very thick and one very thin. An error that has value is one that goes past the rim and strikes into where another coin would go. Most of the time they are easily found by the mint, but some go unnoticed</p><p><br /></p><p>I don&#039;t sort copper (yet), so I can&#039;t help you with that[/QUOTE]</p><p><br /></p>

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