What is this car's mechanical base and who was responsible for the bodywork?
Surely an Expert knows?
This is a strange mix of several cars, realized upon a Fiat 600 base, in Argentina; Front grill and lights are from a Fiat 1300/1500, the back is from a Chevy Impala. It was called Mari Carmen, and was realized by Francisco Ejarque, the same "carroccero" who did also La Monda a car we had in another puzzle. Some years after, the car was given an Abarth kit. It is said to be from 1960, but as Fiat 1300/1500 (grille) is from 1961, I suppose it's a bit younger.
A perfect answer, well done
This car was not made in Argentina, it was made in Spain, by the license plate I presume it was Barcelona.
I if is built in Spain he most probably used a Seat 600 and not a Fiat 600.
this car was named "Mari Carmen" (1965)
Here's it is without the name painted out: