Yep, branches of the Bundesbank. 1080 DM definitely worth it going there in person. But watch out, they are usually only open in the mid morning. Last year I wanted to exchange some DM at the Bundesbank in Mannheim and they closed at 12.30PM and I had to go there a second time. They also accept coins, in contrast to the Dutch banks, I still have 10 Gulden, now worthless piece of metall.