Well, back to the aircraft I know and love: it's all JJ and all DR1.
On a number of occasions posters have asked in this thread and in others "how do you know its 470-17?" Well, I don't!
After collecting and looking at countless images from various sources like C&C and such, plus all the books from Irmie to Leaman to O'Connor, it seems I am in good company. I do not think anyone knows for sure because for any given photo the sources are all over the place with regard to these two aircraft.
That said, I reason that the 450/17 plane is more often mentioned, regardless of photo only when there is no DENT in the cowling. So therefore I assume the dented one is 470/17, but who really knows?
If you've ever built a DR1 or just removed the cowling on one already built you realize if all the cowlings in the Jasta were painted black, there's a good chance that this dented cowling ended up on more than one Triplane over time, except for the fact that the DATA PLATE on the DR1 t was its only real identity after being painted and repainted and that data plate was located on the left side of the cowling. My guess is the cowling and its plate were an important part of crash forensics and they did not under any circumstances trade out cowlings. If this is the case, then I assume that the bird pictured all too often with no devil image and a dented cowl is our 45=70/17 bird. Without a second image of 450/17 preferably from the front, we may never know.
Until then it’s too close to using WHALE FLUKES and the weight of its empirical evidence is subject to question.
but lets look a little closer and the middle photo a bit ...