The last decade of the 20th century produced coins that modern numismatic enthusiasts spend three-, four- and even ...

That's a mint mark. it shows where the coin was made. A D or S stamped on a coin shows whether it was minted in Denver or San Francisco. A P goes on coins made in Philadelphia, except for pennies.

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If all the presses are working, the Philadelphia Mint makes 47,250 coins per minute while the Denver Mint makes 40,500 coins per minute. The coins are then given to the Federal Reserve Banks for ...