Hmmm... I think you do have double die! I am not a pro, unlike many older people here. You should wait for their suggestions. Maybe send it to PCGS or ANACS?
You can compare your coin here. http://www.varietyvista.com/01b LC Doubled Dies Vol 2/DDO 1970-D.htm and here. http://doubleddie.com/823818.html
I don't think so. If you look at your photo of "N GOD W", it appears more like mechanical . The "doubled appearing NGO should be proportionally large as true doubling will have one full size structure + the doubled die portion next too it.IMO. Jim