It's a :
Gatso Platje, 1949.
Fiat 1500 chassis (shortened), Fiat 1.5 litre six-cylinder in-line OHV engine, Dubonnet independent front suspension, finned alloy brake drums.
The car was nicknamed "Platje" = "Flatty".
Leading at the National Sportscar Races held at Zandvoort in 1950, a rear wheelrim centre gave away, putting the car and its driver/constructor out of the race. Flatty was equipped with ultra-lightweight wheels specially made in France, which aided the performance of the car whilst also providing better brake cooling. Unfortunately, the one on the left rear failed to stand up to the high cornering forces generated on the Zandvoort circuit.