If you mean a "D" under the date, it's not an error, it's the Denver mintmark were the coin was made.
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The 1964 Lincoln penny is unfortuantely worth 1 penny. This was not a key date amongst pennies. Most valuable pennies were wheat and Indian head cents dating from 1859-1958
1 cent
It is located below the date.
Roughly 5 dollars depending on the condition.
2-3 cents.