EDIT 3 months later: I never recieved the part. 

I think i have just ordered a very rare version of the synthesizer. But i will finally know what it is when it arrives.

Renault Nr: 7700750509 | Sagem Nr: 21527103 - 00 is the item i have bought. This should be the very first version of the box from a <=1984 Renault 11 in german.

No grounding tab on the side and less used metal foil indicate a very early revision. I really hope this will be the single sided PCB version and a early ROM. 

The last box i bought was advertised as a french Phase1 box and i got a french Phase2 box. Its ok because i didnt have a french Phase2 box, but you will never really know what will arrive...