I don't really know Torsten. I know Nigel is very expert in the 56th fighter group, more than I am. I also know about color shifting of color photographs taken during WWII. A perfect example is the flight of four Supermarine Spitfire MK V's over North Africa. I believe this was no. 417 squadron, a Canadian squadron based in North Africa.
The point is, the colors on the aircraft must be azure blue on the bottom, middlestone over dark earth on the top. At least I think so!
Interestingly, the Spitfires colors are hard to discern in this particular photograph.
I wonder if we could be having similar problems with determining the colors on the late war P-47M's. I thought that the 61st squadron had green-grey camoflauge over grey camoflauge. The 62nd had black on top and natural metal on bottom. The 63rd, which we have been discussing was the two types of blues with the natural metal undersides.
It is funny that so many references for the 63rd fighter squadron, 56th fighter group, have two blues over a natural metal underside. It is all a bit confusing.
I am not trying to argue with Nigel, again, he is quite expert in this arena. I must admit, the two blues are sort of eye catching even if not completely accurate!! LOL Russell
P.S. Your models look great Nigel by the way!!