I love a mystery. I've done some searching, and I am becoming convinced that this bike is a "public" bike or rental bike from modern Germany. The term Framework appears to be the name for a bikeway network system. Denmark has them too. The seat has an adjustable lever for frequency of rider changes. There is a cable lock system built into the bike for locking it at a train station so it is there for you when you get back. There are some links that give me this idea, and this is one:
http://ange.archangelis.com/typo3/ni...ndex.php?id=91