pennyhoarder p h

Thoughts on an "uncirculated" Denver Mint penny. Found this in my father's old coin collection, and have a relative that insists that it is valuable because of the "D" on the face side under the date of 1964. I have no clue where to start... help!

PS. The penny is inside a sealed plastic sleeve, so the photo isn't great. The photo gives the impression that the penny is scratched, but it's the plastic that is scratched and not the penny itself.