Have you checked with some of the german/french communities, they may know more about this?

It's a fascinating board- has chips from AMD, NEC, and TI all over the place, and from back in the fascinating days of manufacturing silicon in places like:
England
Maylaysia
Also that daughterboard is cute- this was a real money gambling machine in europe at one point right? Having the RNG on a complete daughterboard allowed you to swap rates etc or cheat.

Also is this rare? It is not on IPDB and they do have new orleans there (it uses NO roms maybe?)

Edit: it is listed here:
https://bingo.cdyn.com/machines/wimi/old_brussels/
It's the electronic version of bally nashville.