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<p>[QUOTE=&quot;USCoinCollector42, post: 3020906, member: 75732&quot;]In 1990, proof cents were minted <b>only at san francisco</b>. You asked about a 1990 No P proof penny but none of the pennies had a &#039;P&#039; mint mark that year (Philadelphia doesn&#039;t use mint marks on pennies). The reason the first coin below is valuable is because it was minted in San Francisco but lacks the &#039;S&#039; mint mark.</p><p><br /></p><p>A good way to distinguish the No-S proof from a regular Philadelphia cent is to look at the field (background) of the coin. The proof coin will have a reflective mirror-like surface unlike a normal cent. </p><p><br /></p><p>Valuable coin:</p><p><br /></p><p>[ATTACH=full]751228[/ATTACH] </p><p><br /></p><p>Normal coin:</p><p>[ATTACH=full]751229[/ATTACH] </p><p><br /></p><p>Next time please post your own thread if you have a question instead of hijacking this year old thread.[/QUOTE]</p><p><br /></p>

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