Man, that's pretty cool. Matched Bb/A sets are always worth a lot, almost no matter what.
The German system is a bit unusual in the United States, but I always thought it was neat. I'm not a fan of the rollers down low, but I suppose they have their uses.
It's been a while since I've been very engaged in the market pricing, but I would assume that a premium pair like this, in good playing condition, may fetch in the neighborhood of $1500-2000.