Does this count as a prototype or production car?

JFK wrote
what is it?

Rinspeed wrote
Well it is "Zero Series". They were used as a testing vehicles for upcoming 1.1 model and later employees bought them.

JFK wrote
is there a real difference with the normal one?

Rinspeed wrote
Bumpers and lights from 601, bonnet, mask, engine and badges are from 1.1.
Vorserie changed the rear lights from 601 ones to 1.1 ones, but it still have old 601 bumpers.

so i dont know

I would say concept, as it wasn't meant to be a production car itself.