And AFYI, you might find it interesting that this 1944-D cent is made from spent shell casings from the war. It's a slightly different alloy.
The correct terminology is Doubled Die.. not Double, big difference! I want to share this webpage with you - http://www.error-ref.com/double-die/ and https://en.wikipedia.org/wiki/Doubled_die Quote - "Note that the proper terminology for this occurrence includes the letter 'd' at the end of the first word, hence "doubled die". The term "double die" without the first word ending in 'd' is not proper numismatic terminology." closed quote