Re: 109 K-4 RLM 84?
There was no RLM84 although several authors who have looked into the matter (Merrick, Poruba and I think Ullmann) all agree that there was a new color for undersurfaces late in the war.
The explanation being that as the color has been found on different aircraft in different locations, as well as aircraft made in different manufacturing plants, a faded or somehow corrupted RLM76 batch is unlikely as it's use seems to widespread.
/Anders
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