The P3 Monoposto was the first genuine single-seat racing car in Grand Prix racing. It was powered by an eight-cylinder engine built around two four-cylinder blocks, each fed by its own Roots supercharger. The car designed by Vittorio Jano was introduced in June, halfway through the 1932 Grand Prix season in Europe, winning its first race at the hands of Tazio Nuvolari, and going on to win 6 races that year driven by both Nuvolari and Rudolf Caracciola, including all 3 major Grand Prix in Italy, France and Germany. This old scale model by Rio represents first prova (test) version of the P3.
| Season | Series | Event |
| 1932 | Grand Prix | Test |
| Driver | No. | Entrant |
| Scale | Manufacturer | Collection |
| 1:43 | Rio Models | |
| Cat. No. | Quality | Rarity |
| 5 | 
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