No, 203 is correct. The Dubois coupe was built in 1952/53 by Sodisto, a Peugeot dealer in Argenteuil. All 17 cars had a Frua body on a Nardi chassis, the mechanical base was the Peugeot 203 Constantin. The last cars were remodeled by Frua with an oval radiator grille, front bumpers and a panoramic rear window, like the puzzle car. Attached you can see the full puzzle picture with the text referring to the car as a 203!