The U.S. Mint no longer maintains a collection. In 1923 the Smithsonian Institution received the collection and it is now part of their National Numismatic Collection.
Wondering the answer myself.....
No US coin bears an "F" mint mark
Harriet Tubman has never been on a US Mint Coin.
The optimal way to determine when the US Mint will mint a specific coin is to refer to their web-site: USMINT.gov.
You are probably thinking of an "error coin". This coin is any coin which does not meet the standards of the US Mint or has a flaw in its design or manufacture.
If there isn't a mint mark on a US coin, usually it means that such a coin was minted in Philadelphia.
The earliest the coin was produced by the US mint, the more rare it probably is. However, the mint state would also contribute to the coin's value.
This is a novelty or magic coin that has been altered and was not produced by the mint And has no collection value at all.
They never have. If your coin has a hole and is a US coin then someone drilled it in. It was not done at a US mint.
Please post a new and rephrased question with the coin's date and denomination. A mint mark on a US coin is a small letter indicating where the coin was struck, so it can't be sold by itself - it's part of the coin. Especially on older coins, the mint mark can affect its value because coins of the same date may be scarcer from one mint than another.
On an US coin it can mean "cents" or it can be the mint mark of the Charlotte Mint, which existed only from 1838 to 1861.
An official "US Mint Set" is a Uncirculated coin set. They have uncirculated examples of every denomination issued from each mint for the year of issue. They are the same.