 Although the surviving prototypes differ in detail, the basic architecture and boxy shape of the car had evidently been “right first time” and the Simca 1000 of 1961 is entirely recognizable as the model that Pigozzi had selected from Fiat's “Project 122”.In the meantime, in Italy the Fiat 600 continued to sell strongly and there was little sense of urgency about investing to replace it.Management evidently decided that a four-door replacement for the 600 would represent too big a jump from the existing car.