This looks almost exactly like Hoyer Session basses that were made in Germany somewhere around late 70s to early 80s, those were really nice, the 2 differences I see are slightly different electronics/controls (some or all Hoyers had a "slap dent" and an XLR/active too), and that Hoyers were neck-through. The rest seems to have carried over, including Schaller bridge and tuners.
I recently got one that was converted to 8 strings, and I really like it, to the point that I'm buying an unconverted 4-string (reserved and pending, original except the pickups), and I'd buy yours to defret if it was in the EU. For what it's worth, I'm paying 900 euros for each of the Hoyers and loving it, and I live next street to Germany. Besides electronics the only thing I'd change is I'd add more contouring of the edges, it might feel tad sharp if you tilt the bass while sitting. Here's a couple pics, I can make more of the 8-string.