I'm on the 70's cents, so forgive me if I go off the deep end. I tend to look at cents to long. While researching the 71 it seems the obverse gets more publicity then the reverse. Is the 7 in the date doubled? What about the b in liberty? Now the reverse....look at United, the o in one and for that matter all of the reverse. I think it's more dramatic than the obverse.
There are no 71 DDR'S so most likely MD is all your seeing, better pictures would help. http://www.varietyvista.com/01b LC Doubled Dies Vol 2/DDO 1971.htm
