Laurent,
I do agree with you...all information points me to a "fake" document, sadly.
Junker: I wish I had one name that could possibly matches.
Here is the link to the image:
https://www.luftwaffe-research-group...e-n-c-o.27527/
I was searching amongst JG 52 but was informed that JG 5 also could be possible (late in the war). Surely a 21 victories fighter pilot would not have passed un-noticed, I do agree...this is why I believe it could be a fake document, in spite of it's looking like original.
A.