So very many were made is just a penny
It's worth about 2 cents due to its copper content.
It is worth face value.
It is located below the date.
SIMPLE ANSWER: No US coin dated 1965, 1966 or 1967 will have a mintmark, it's just a penny.
A 1914 penny with no mint mark is worth about $1.50.
A 1943 steel penny with no mintmark can be worth $.35 - $1.50
2002 mint sets in original package have a value of $15.00 to $20.00. The penny has never had a P mint mark.
A U.S. 1965 cent (not penny) was minted without a mint mark. It is a common coin. A 1965 Great Britain penny is worth 10 cents if uncirculated.
It's worth about 2 cents due to copper content.
The value is determined by the date, mint mark, and condition. Without knowing any of those factors, your question is impossible to answer.
The mint mark does not determine the value of a coin. If you have a penny and want to know what it is worth, please submit a new question and include the date on your penny as well as the mint mark.
The US mint never made pennies like this. Plus without a date it is impossible to determine the value.