This looks totally German to me from a factory in Klingenthal or Berlin, possibly Markneukirchen or maybe from or with a Czech border side shop. That area of the world within less than a 200 mile radius. Mainly that distance north to sound and a fraction of that east to west. Just a guess.
The repair looks to be more expensive than the bass is worth to be fully done to high standards unless you are doing only the minimal amount of work needed and working for minimum wage or less. This is a big job.