Speciale (or 275 GTB/C Speciale). Designed under the supervision of Mauro Forghieri, this model was intended to succeed the 250 GTO as Ferrari's GT-class entry during the 1965 racing season. Ferrari constructed four cars of this type, three of which were manufactured between late 1964 and early 1965, while the fourth was completed in 1966. These cars were equipped with Tipo 213 engines tuned to 250 LM specification, producing approximately 290-. The extra-thin-gauge alloy bodywork (designed by Pininfarina and built by Scaglietti) was significantly different from the production 275 GTB, with a more streamlined shape similar to the 250 GTO and the 330 LMB. All four cars had slightly differing hand-built bodywork, possibly due to ongoing aerodynamic experimentation by Ferrari engineers. The chassis was a lightweight version of the production Tipo 563 chassis using smaller diameter tubing. Additional weight reduction was accomplished by drilling holes in interior panels, Plexiglas windows, and the use of magnesium castings for parts of the engine and transaxle. The owner of one 275 GTB/C Speciale (chassis 6885) estimated the curb weight as approximately . The Fédération Internationale de l'Automobile (FIA) at first refused to homologate the model for the GT class but settled on a compromise when Enzo Ferrari threatened to abandon competing in the GT class. Due to this delay, only one 275 GTB/C Speciale (chassis 6885) raced during the 1965 season. This car competed at the 1965 Targa Florio, where was driven by Bruno Deserti and Giampiero Biscaldi but failed to finish. The car placed 13th overall at the 1965 1000km Nürburgring, driven by Biscaldi and Giancarlo Baghetti. It finished 3rd overall at the 1965 24 Hours of Le Mans, where it was driven by Willy Mairesse and Jean Blaton (under the name "Beurlys") for Ecurie Francorchamps. Following Le Mans, the car placed 11th overall at the 1965 500 km of Bridgehampton and won the 1965 Nassau Tourist Trophy. Due to its role as a 250 GTO successor and its visual similarities with that model, the 275 GTB/C Speciale is sometimes referred to as the "GTO '65", although this was never an official factory designation. A 1964 275 GTB/C Speciale (chassis 06701) was sold in 2014 by RM Sotheby's at their California auction for $26,400,000. 275 GTB customer competition cars Following the creation of the 275 GTB/C Speciale and the subsequent homologation struggles, Ferrari decided to create a less-radical competition 275 GTB to