It's called a mint mark and identifies the mint that struck the coin.
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A letter is usually a mint mark, indicating where a coin was made. For example, on American coins, P stands for Philadelphia, and D means Denver.
One.
1 cent. From 1965 to 1967, no U.S. coins carried mint marks.
No they are not, in general just because a coin has a mintmark does not make it more valuable.