G20 Vin

Does anybody know where the VIN# is located at a 1983 G20? It's written on a plate behind the front window but here in Europe it needs to be written on the chassis/body too, to be registered.

That plate behind the window is actually affixed to the chassis since your 1983 G-20 is a unibody and actually has no true chassis. That is the only place I know of for it to be.