Looks like Ohio Class in production 1978-1997. If it is then 18 were made (at least according to the govt).
I'm sticking with concept.
...Just enlarged the image for the first time (data limits, dontcha know) and I could be wrong, but that flat area looks like it "might" be conceptualizing a solar panel, for being able to recharge batteries without engines. ...Guess it could also be a heli deck. ...Maybe even both!! But I can't find any images of an Ohio Class that's similar.
To me it looks like it's firing a ballistic missle.
Just an afterthought you might want to inquire at Electric Boat Work (public relations) located in Groton Ct if they could tell you anything about the painting.