Have you looked into it on your own? If not, here's a starting point.... http://doubleddie.com/431101.html
I really can't tell from the pictures. Most of the recent doubled dies have extra thickness on some of the letters in one direction typical of Class VI doubling. I don't see that in the pictures above. I agree that the link above is the place to start with your coin.
Not saying it is a doubled die, the pictures just aren't clear enough for me, but it does look promising. You "might" have something there.
I think I see it on BERT, but, since those pictures are so magnified, I'm not sure it would count as a doubled die.