1963 Ferrari 275 GTB SEFAC.
Its the first 275 GTB built (prototype), on a 250 GT chassis/drivetrain.
Differs in looks from its later sisters as it has the 250 LM style tunneled back window treatment.
That's the car, yes. It was a project of SEFAC (Societa Esercizio Fabbriche Automobili e Corse), set up by Enzo Ferrari and Michel Paul Cavallier, a car-mad French industrialist, in 1960 to further new projects, and was, as you say, the first 275 GTB prototype.
The similarity of this car to the 250 Lusso, the 250 LM and the 250 GTO 64 can be seen in the rear, although it pre-dated the GTO and was just 5 chassis later than the first 250 LM (its chassis number is #05161).
It was badly damaged in a roll at Fiorano in 1963 and was rebuilt into a convertible, spending much of its life in the Sacramento, California area. But in the 1990s it returned to Europe and was restored to its original coupé style.
Well done!