I did read some info on that car I think it was somewhere within this
"car catalog" collection of images articles/brochures etc its all in French. I had a bit peruse of the "small four" collection which covers "L'histoire des automobiles françaises aux Etats-Unis"....fascinating! It is an absolute treasure trove of interesting images, and googly translate isn't too bad at getting the gist of the articles although in its literal translation it does massacre the original French.
So I am not sure if ever more than one was made. It is based on a Renault Fregate and is variously called an Abarth Renault Fregate, or an Abarth Renault Boano
This is another variation of the Fregate being a Cabriolet Chapron, and rather a nice 2-tone as well
regards Neil