Here they come:
So, as you can see, it's a Sachs GALAXE HT. Drum brake built in, and a very rare, proprietary cassette spline. Luckily I have the cogs/sprockets for it. And I have not, actually laced a wheel around one, I only painted it and almost got the spokes of the correct length, but then I lost a couple of them (it's a long story how that happened).