So I bought the 1960 DDO-001, and the super kind seller included two bonus coins. One is a 2015 Lincoln cent WDDR-005 in top condition, and the other is this one, a 2015 Lincoln cent DDO-001. What an awesome seller!
This DDO-001 looks like it might upgrade the one in my set, and is the earliest die stage I've seen on one of these as just look at those notches! The complete separation lines are visible on many of the devices but not all show up in the photos as I'm short on time and just couldn't quickly figure out a lighting angle to show them all at once.
Anyway, a truly spectacular bonus coin. Hoping to do more business with this fellow in the future if all his coins are this strong.
2015 Lincoln shield cent doubled die DDO-001