Thanks Jörn,
I knew you would come up with something

 Is it know wether this Ju88 carried a Werknummer anywhere?
And one more thing: According to Ketley/Rolfe the background color of the NJG7 emblem should be yellow. However, on this photo from D9+PH as well on two others from D9+OK (in a scrapyard) the color underneath the eagle appears quite dark. Orthochromatic film or just a variation of the (supposedly) yellow emblem?
Cheers,
Christian