E104's are all portraits with blue captions
this link breaks it down easier than I can explain it
http://www.oldcardboard.com/e/e1/e10...?cardsetID=746
The E92 Nadjas have the same fronts (images and black caption) as some E90-1 and the other E92 sets., thats why they arent grouped with E104 I believe
Ive always thought the blank back (anonymous) E104s did not come in Nadja products, but maybe some other unknown candy/bread/tobacco ??