Question is not clear. The U.S. mint makes the coins used in the U.S. A mint is a place where currency is manufactured.
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.
It is a tiny letter, usually near the date, that signifies whihc mint the coin come from. On American coins, if there is no visible mint mark, it is from the Philadelphia mint. A "D" indicatges the Denver mint.
No such coin was minted by the US mint.
The US mint did not use mint marks on the 1965 half dollar coin.
The "P" Mint mark was not used on any US $1 coin until 1979. Your coin was struck in Philadelphia
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.
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.
It is a tiny letter, usually near the date, that signifies whihc mint the coin come from. On American coins, if there is no visible mint mark, it is from the Philadelphia mint. A "D" indicatges the Denver mint.
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.
That depends on the denomination of coin.
No it did not.