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Coins and Paper Money
US Coins
Plural Nouns

Why are there letters under some dates on pennies?

Answer

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Wiki User
September 03, 2007 2:10AM

The letter indicates the Mint that struck the coin. Mint marks appear on all current U.S. coins except for cents that were struck at Philadelphia, PA and West Point, NY.

See for example http://www.coinworld.com/news/012306/bw_0123.asp