And there is a "sister" aircraft from the same unit here
https://www.ebay.de/itm/235900128494...90.c101224.m-1
First I dismissed it as the same aircraft in your photo (the quality is not really tip-top) but
it is not! The Bestellnummer is different.
Right now I am too lazy to go through a lot of photos to try and determine if this quite odd
digit 7 (or is it something else?) actually is a unit marking or if the same pilot had two aircraft
assigned to him.
Any thoughts?
Cheers
Stig