than in the production 250 GTO, with scattered instrumentation and a bare aluminium dashboard. The second prototype was tested at Monza in September 1961 by Stirling Moss. Results were promising, as the prototype was able to lap the circuit faster than a 250 GT SWB. However, the high speed stability issues seen during testing of the first prototype remained. Shortly after this test, construction of the first production 250 GTOs began in late 1961 with chassis 3223GT and 3387GT. As the prototype was no longer needed for testing, the experimental body was scrapped. Regardless of the identity of the chassis, sources are in agreement that the second GTO prototype was either partially or entirely scrapped and is no longer extant in its 1961 form. If 2053GT was indeed the chassis, it was then given a 250 GT SWB style body and sold to Jacques Swaters. 2053GT crashed during the 1962 Nürburgring 1000 km and was then rebodied by Carrozzeria Sports Cars. Subsequently, 2053GT was totally destroyed in an accident at the 1964 Spa 500km. Variants and related models Handbuild production, updates, and repairs throughout each car's competition history result in differences both visible and invisible between individual 250 GTOs. Variance in air intake/vent configuration is common among cars. Modifications to the original bodywork were performed by the factory, Scaglietti, or other body shops, usually after crashes or according to a racing team's wishes. In 1964, Ferrari tasked Mauro Forghieri and Mike Parkes with redesigning the 250 GTO's bodywork, resulting in what became known as the GTO '64 (or Series II). Three new cars were produced to the 1964 specification, and four earlier 250 GTOs were retrofitted to it by the factory. This redesign was intended to maintain the GTO's competitiveness for one more year, as the FIA decided to not approve the 250 LM for GT-class racing during the 1964 season. The Ferrari engineers incorporated many of the 250LM's aerodynamic features into the 1964 GTO. This resulted in a visual similarity between the two models, even though the GTO does not share the 250LM's mid engine rear wheel drive layout. The factory also made minor modifications to the engine, gearbox, chassis, suspension and interior. Despite these changes, the overall performance improvement was slight. The GTO '64 still saw some racing success with factory and privateer teams, including an overall win at Daytona in 1964 by Phil Hill and Pedro Rodriguez