Here is the thread:
http://www.network54.com/Forum/526604/message/1241372450/Is+this+an+N+or+T+card-
They are mostly likely a German Issue since the bottom says "Serie" rather than Series. (Although I believe other languages also use "Serie.")
Check out my post, entitled "DKA" in that thread. DKA was one of the large publishers of Trade Cards during the T-Card era. They have a few English issues, of which this subject is the most common.
As far as I can tell, they are 3rd in total cards published in Germany although the cards from the top 2 publishers are less common over here.
Such German trade cards are found much less frequently than German tobacco cards which are generally Post WWI. They are also much more attractive, IMHO.