A typical Autopuzzler day - looking for clues on the Renault 4CV Coupe, and instead I came across the answer to this.
It's a 1960 Lancia Aurelia Paronzini Monoplace, being sold at auction by Artcurial this year. Apart from that, I cannot find any further infromation.
It's probably a special built by an Italian enthusiast - the body style suggests it was built in the early 60s, long after the Aurelia went out of production. The smallest engine in the Aurelia range was 1754cc and this car seems to have an engine even smaller than that ! Very odd.
Further investigation reveals that it was built in July 1958 by one Francesco Paronzini who had been impressed by the British rear-engined cars from Cooper. Power was a 2-litre Aurelia B21 with dual Webers developing 90BHP. Front suspension and brakes were from Alfa Romeo.
Presumably he intended to run the car in the then-current Formula 2 category.