You'll find several other Marsonettos have already been posted and solved on AP.
Mario Marsonetto was based in Lyon and was active 1957-1959 and 1965-1972.
I believe total production was 16 or more cars.
I don't know the model name of the puzzle car but I suggest you alter the marque to "Marsonetto" rather than "La Marsonetto" (the Marsonetto). It may make it easier for future searches.
I'm familiar with the other Marsonetto cars but I have never come across this one before and can't find
any information about it anywhere beyond one website. That website does clearly call the call "La Marsonetto" but as I have no idea I'll change it back to just 'Marsonetto'.
This pictures I have are just the small ones that I have resized, so they are not that great, but here are the other views: