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No mint dimes 75 & 73
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7 posts in this topic

   Welcome to the NGC chat board.

   Traditionally, coins made at the Philadelphia mint, which was the first U.S. mint location and the primary rather than a "branch" mint, bore no mint mark.  The "P" mintmark first appeared on wartime composition five cent pieces coined in Philadelphia from 1942-45 to distinguish them from regular composition pieces. In 1979, the "P" appeared on Susan B. Anthony dollar coins minted in Philadelphia and has been used on all denominations except the cent since 1980. (The "P" mintmark appeared on Philadelphia cents dated 2017 to commemorate the mint's 225th anniversary.)  Therefore, your 1973 dime (mintage 315,670,000) and 1975 dime (mintage 585,673,900) are normal coins minted in Philadelphia for circulation and in worn grades like yours are only worth face value.

   The 1975 "no S" proofs about which you have heard were coins minted in San Francisco with a mirror finish and sold to collectors in sealed proof sets. The "S" mintmark was left off the die by mistake, and nearly all of the coins struck by this die were evidently intercepted by mint inspectors before release. Only two proof sets (2,845,450 sets issued) containing a "no S" dime have ever been found.

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Hello and welcome!
 

There was a regular circulation 1982 Roosevelt "No P" dime. A mint employee had mistakenly left the mintmark off of one single obverse die which typically struck 70,000-80,000 pieces so they are quite difficult to find and most likely by now all removed from circulation.

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