It's a handsome coin in its own right in my opinion and a fine example of multiple die chips, but (1) there's no correlation whatsoever between die chips and doubled dies and (2) there's little question based on these pictures your doubling is strike doubling. Show me "IN GOD WE" close up, and I can be sure.
That second sentence wasn't necessary, was it? For that, I'm not going to tell you what diagnostics, how do you like that?
No I do not see that it is "clearly obvious DDR". The left vertical bar of the U is fat. The right one is not. The appearance of a split serif at the top left of left bar looks like a hit or shadow to me. If there was that strong of a split serif there, there would be one on the right bar, along with evidence (separation) along the vertical bar. There is no evidence on the B or S or M or dot. There would be some sense of uniformity to the doubling. The left bar of the U either got smushed a little or was not fully struck up. EPU is opposite Lincoln's coat, which is the deepest part of the obverse die. There sometimes isn't enough pressure to get the metal to fully fill the recesses of the die in this area. Look at this image and see what I am talking about. This image is courtesy of Variety Vista and Dr. James Wiles.
I dunno, the left side of the U is fatter than the right side in a normal undoubled state, and not supposed to be with uprights on either side as shown on the Wexler and Wiles example both. Scale off this drawing to either of those, since the OP's image doesn't have enough there to do it, and you will see the EPU has wider uprights than a normal die. Need a 1960D proof to check it against? <EDITED> Whatever it is on the back of the WDDO-010 and VV coins in this thread, they are cool looking. Be nice to see the OP coin in this level of detail, or near it.
If we are talking about thickness only, without separation, it would be a Class 6 (distended hub) doubled die. Take a look here: http://doubleddie.com/203948.html You will notice that a lot more than 1/2 letter is effected. It's all about how the doubling is created during the hubbing process.
Then you don't seem to be looking, both sides on Wexler's and Wile's show doubling, increased thickness or width, and a line of separation on both uprights.
No I'm looking. Wiles does. Wexler's doesnt I'll tell you what. Just email Wexler & tell him you may have found a listing he overlooked and ask him his opinion. I know the answer, but at least you can get closure.