Most likely the image you see on your penny is John F. Kennedy.
These Lincoln/Kennedy novelty items were popular advertising items back in the 70's.
This is not something done at the Mint. Somebody took a stamp and manually counterstamped Kennedy's image onto the penny after it left the mint.
These novelty items generally sell for about a dollar.
Harry S. Truman had nothing to do with any double eagle coin, but Theodore Roosevelt did. Post new question.
If its an authentic signature and it checks out by an authority on historical signatures then yes, it most definitely increases the value.
the value of a 2007 penny is 1 cent.
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The "face value" of any coin is whatever is inscribed on it. The face value of a Penny coin, is One Penny.
The 1930 penny
It is worth a penny
This is not enough information to give an accurate value amount. Need to know 'Type' of penny, 'Date' of penny and 'condition' of penny.