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<p>[QUOTE=&quot;RonSanderson, post: 3605056, member: 77413&quot;]I have two more, slightly more subtle, but fun observations.</p><p><br /></p><p>4. Look closely at the faint lines on the top coin. These dies are workhorses that stamp out high volumes of cents. Essentially they are part of an industrial process, and they wear and get touched up. These lines are gouged into the die surface by roughly polishing it, creating these faint hairlines. The proof dies get special preparation to ensure highest quality.</p><p><br /></p><p>5. Proof coins are struck on specially prepared planchet (or blanks). Here’s a typical blank for a business strike coin. </p><p>[ATTACH=full]965158[/ATTACH] </p><p><br /></p><p>It takes a beating as it goes through numerous manufacturing steps. You can see a number of places under the Lincoln Memorial where the marks still show after striking. The proof uses a polished blank to help give that smooth, mirror-like surface.[/QUOTE]</p><p><br /></p>

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