The value of a penny with no mint mark is generally one cent. These pennies are the common cents that were minted in Philadelphia.
Older (i.e. pre-1950) Philadelphia cents can be worth more but it depends on their date and condition.
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The value of any coin depends on its condition and date. The lack of a mintmark simply means it was minted in Philadelphia; US cents, often mistakenly called "pennies" after their British counterparts, have never had a Philadelphia mint mark applied to them.
The letter D is the mint mark so it can't both have a mint mark and not have a mint mark.Please see the related question for more information.
No mint mark means it was minted in Philadelphia. The quarter is worth exactly 25 cents.
In 2011, the U.S. Mint produced 4,938,540,000 pennies.
YES I have one.