This chassis came out of my french-built Atari Gran Trak-20. I can't see any brand or anything on it. I believe the same chassis is used in two more of my presumably french-built Atari cabinets (two of the Cherry kiosk modules from this thread:
https://www.dragonslairfans.com/smfor/index.php?topic=7263.0). Is there any documentation on it?