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<p>[QUOTE=&quot;medoraman, post: 2020002, member: 26302&quot;]Like Chris said, proof is a different type of manufacturing. It started as a &quot;proof&quot;, a special strike to &quot;prove&quot; the dies were correct, like an artist&#039;s proof. Over the years it became a special gift for dignitaries, and later coin collectors. A proof is created with special preparation of the coin metal, then specially prepared dies are used and struck with much higher pressure, usually multiple times. This creates a very special coin. Proofs are ONLY sold at a premium from the mint, never into circulation.</p><p>&nbsp;</p><p>What happened in 1990 was a proof cent die was erroneously not punched with an S denoting San Francisco. They are very rare. They only were available in proof sets. What makes it confusing to you is Philadelphia circulation cents never have had a mintmark on them, so to you it appears your cents are the missing S cents, but the only missing S cents which are valuable are the proof cents.</p><p>&nbsp;</p><p>Make sense? Bottom line, if the coin is not frosted like the pic above, and was not found inside a US mint proof set, its not the rare coin sir.[/QUOTE]</p><p><br /></p>

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