I am sure that the puzzle pic and Carnutīs photo show two different vehicles!
Carnutīs vehicle is this one:
My oldest photo of it is from 1936, which claims a certain Mr. Michel Andre to be its constructor and does not tell a specific model name.
The next photo shows the same Andre vehicle probably with its inventor after having crossed the English Channel in 1939.
The photo at the bottom shows the so called "Notilus X-Z-55", built by a certain Mr. R.Burnet of Chalot-sur-Saone.
To my best knowledge it has been presented to the public in 1960.
I think this should most probably be the puzzle vehicle if you compare all the details.
The puzzle pic shares the same design and opening direction of the roof hatchway, the small front hatchway, the tires, the front screen etc. with the Burnet "Notilus X-Z-55"...
What do the others think?