Your coin is too worn for me to tell. Can you post a photo of the entire obverse and a closeup of the entire motto "In God We Trust". Thank you.
The numeral 7 is the only thing that makes me think it was a doubled die but all the other numerals and letters are flattened by wear to say anything either way. Check if the letters in LIBERTY compare to anything on this site: http://www.varietyvista.com/09b WQ Vol 2/DDOs 1970-D.htm