I can't see any doubling, maybe because of the pics, but I'm pretty sure it is not a DDR. This might help
Wow! Nicely done. One of the best illustrations I’ve yet seen. As a kitchen and bath contractor there very easy for me to relate to .Thanks . Can you tell me if my photos are decent? Just started all of this a few months ago. Never posted anything on line so all of this is a bit of a challenge .
That diagram is actually from an old thread here on cointalk, I did not do that. Your pics are okay, the first one of the reverse is a little blurry, though. I do suggest using a bright white light for photgraphing coins to bring out more detail (I either use an LED pen flashlight or LED/fluorescent desk lamp).