Are 1923 coins valuable?

How can I determine the value of a collectible coin, 1956 penny?

Is there a penny that has a Kennedy face?

Should I be concerned about a two year old that swallowed a penny?

What is the value of a 1945 mercury dime, brilliant, uncirculated, with no contact marks & full distinct bands on reverse?

What should I do if I find a defect in a penny?

Which American pennies are valuable?

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