Is she a beauty or what ?
I have never seen one like this before. Never. Only the add that Time Pilot put up in the Zaccaria thread:

As you can see the side-art is identical to Buck Rogers, but the rear window is "blank". Also the bezel is different (generic) with locations to put game instructions on the sides.
This is another indication making me think there has never been a game in this machine....no instruction labels. Of course, no guarantee, but this combined with the missing PCB, still intact protective film....it may have been unused....
The monitor is also the original Hantarex. PSU is in there and also 2 speakers. I forgot to check for coin-mechs. There seems to be a hole right next to the yoke. No idea what should be there (coin-mech ?)
I also don't remember if there was a gas-pedal or not.
I guess this is a Jamma machine since that add mentions "Universal cockpit" and "Mit jedem TV-spiel zu bestucken" which translates to: can play any videogame....
I think I remember seeing pics of the Buck Rogers cab that was split in two parts, so I guess this one comes apart too, which makes it easier to transport.