In October 1951 the 300 S model, was presented at the Paris Motor Show.
The new model was positioned as a parcticularly representative car with sports-car characteristics and it met the highest demands with regards to roadability and speed.
Technically the 300 S was derived mainly from the 300 model. In contrast to the 300 model, however, it had a curtailed chassis with a wheelbase, which was 150 mm shorter. Higher compression and the addition of three carburettors boosted engine power to 150 hp. This made a maximum speed of 175 kph possible.
The 300 S model was available as Cabriolet A, as roadster and as a coupe. The roadster basically corresponded to the Cabriolet A, but it had a lighter, fully retractable hood without coach joints. Serial production of the three versions started between June and September 1952.