Regarding the markings on the tail fin... you may have stumbled on a pattern that I was not aware of. So I've looked over a bunch of K-4 photos and lo and behold... there are a number of machines that have light colored markings on the tail fin, most notable around the vertical joint between the rudder and tail fin.





There are just as many examples of machines with no such markings. Lacking any other information besides a catalogue of photos, it's my belief that this was a common area of failure and that repairs were sealed with putty/paint. Not a standardized thing but simply an as-needed repair than many K-4's were afflicted with. I would base my painting on the photo references of 265 first and foremost and use the other examples for any speculative choices in areas which the photos of 265 don't show. As for color, I'm not sure but I've heard these puttied areas to be described as a reddish brown, light grey or light blue (such RLM 76).
I hope that helps!


