I am sifting through all the early 1960-1964 Proof Sets I bought over the past few months and have another coin that would probably render a minor DDO
The only area I see any doubling is on the E PLURIBUS UNUM. Tonight, lighting was giving me issues, so I took the easy way out and set the magnification to high

http://www.minterrors.org/wp-content...15/10/01-E.jpg

http://www.minterrors.org/wp-content...5/10/02-PL.jpg

http://www.minterrors.org/wp-content...5/10/03-UR.jpg

http://www.minterrors.org/wp-content.../10/04-RIB.jpg

http://www.minterrors.org/wp-content...5/10/05-US.jpg

http://www.minterrors.org/wp-content...5/10/06-UN.jpg

http://www.minterrors.org/wp-content...5/10/07-UM.jpg

http://www.minterrors.org/wp-content.../10/08-epl.jpg

http://www.minterrors.org/wp-content...10/09-plur.jpg

I don't know what this is below Jefferson's Neck, but it looked odd;
http://www.minterrors.org/wp-content...10/10-neck.jpg

http://www.minterrors.org/wp-content...0/DSC07307.jpg

It surely looks like a DDR, but the way the metal was flowing around that rim, I am thinking it has the possibility of being some sort of weird die ejection doubling / machine doubling. If I had to make the call, it would be to the side of the DDR