A pretty standard one (68040 non-Turbo) in the collection of the Arithmeum in Bonn, Germany (
https://www.arithmeum.uni-bonn.de), running NS3.3. It has Doom installed! :). The Arithmeum collection has many more interesting machines, of course...
Everything looks like it's in great condition. Nice find! I'm glad that it's in good hands and gets to be on display.
The Cube is on display and running during demonstration sessions (even the screen is still in good shape), along with a Lisa 2, Apple //europlus and ///, a Mac Plus, an original IBM PC 5150, a CBM PET2001 and an IBM 5100 APL machine (and a lot of other machines on display in the shelves - from DEC to IBM z-Series and really exotic stuff). The Arithmeum takes really good care of their machines.
Nice Cube!