I have never heard of that make. I would guess at 100 years old, possibly more, based simply on the fact that we would probably have heard of it otherwise. I always like to see pictures of the inside, with the covers removed, ideally after you have picked up (and saved) any loose parts inside, then vacuumed inside. I save the loose bits in a bag inside the piano away from the pedals.
The quality of parts used in that area of Germany by well known higher volume makes like Scheidmeyer & the likes were often bought in and really good quality. Nice uprights from that time come from there and Leipzig.