This is a keyboard used together with a very expensive cash-register for German drug stores. While they keycaps are definitely real Cherry Corp OEM, I am not sure if the PCB is. There is a "9144" number stamped on the PCB, which could mean G80-9144, since cherry used the 9___ namespace for custom case keyboards.
The board includes a trackpoint (broken) very similar to those on IBM keyboards. The board connects with a RJ connector, but is most likely using default PS2 protocols. I mailed the company who distributes them in hopes for pinouts. Lets see how it goes.
Other than that, the keys are the rare "all white" double shot variant, made by Cherry. Plate-mounted Cherry MX Clears with diodes, most likely N-Key rollover. All "big" keys have proper stabilizers. The right shift key has to be the smallest shift key on a mechanical keyboard ever. Single sized even beats Japan!
Case construction is very interesting, since the PCB is directly mounted to the frame, resulting in a hollow case.
