I bought this basically awesome thing on eBay recently. I don't have the original box with me unfortunately, but I'm happy to mail it to you later.
It’s a nice mechanical keyboard, still made in Germany and with a trackball right on the right side. It also has the option to toggle a numpad onto the regular keys using the fn key.
The catch: It has some kind of European QWERTY layout (couldn’t figure out which one with 2 minutes of research) and, more importantly, it has smaller key spacing than usual—hence the "XS" in the name. That makes it take some getting used to when typing, but as long as you can handle that, it clicks very nicely.
The trackball works too, as long as you don't flick it insanely fast, which is just how those things are.
Open to price offerings, can be tested. If you pay me 40 EUR I didn't loose money on it.
contact info: Mail: 39c3@pzauner.de signal: pzauner.37 Matrix: @pzauner:matrix.org