Hej!
If I remember correctly Library of the Helsinki University of Technology does have an incomplete collection of Junkers Nachrichten. I have paged through them and indeed the illustrations are excellent! I think we are talking about the same publication. The magazines are/were (read more) in the closed collection in the basement, but it helps if one is HUT personnell.
The problem is that I could not find the magazines in the electronic catalogue (at:
http://lib.tkk.fi/index-en.html - click "Teemu" at left frame. I hope they haven't get rid of the magazines as they have done with many other (though more recent) material.
MvH,
Kari