The A & M in your first picture are MD ( Machine Doubling), not really DDR and no extra value. See how the devices are reduced in size, and that area is flat and shelf-like.
If you want to find some good reading with a lot of image try this: CoopHome Click on that like and see if a lists shows up? On my page 2 there is an updated lists of things. Probably all the ones you want to know.
It's Machine Doubling, not a Doubled Die. Note that the devices are reduced in size and is shelflike in appearance? That's because it happened during the strike. The die damaged the coin by bouncing a little during the strike. A real Doubled Die actually happens during the die making process. Here's a good read for you. http://doubleddie.com/58222.html
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