In 1954, a more powerful version of the Lampredi V-12 was enlarged to nearly 5.0 liters and was installed in some 375MM models. Dubbed the 375 Plus, the car differed from its predecessors by a large bulge at the rear necessitated by a larger fuel tank and a spare wheel. The chassis was modified with a DeDion rear axle. With nearly 350 horsepower, the 375 Plus scored two important victories in the 24 Hours of Le Mans and the Carrera Pan Americana, winning the World's Sports Car Championship for Ferrari in 1954.
The second Ferrari built for King Leopold II of Belgium, this 375 Plus Cabriolet is the last of the 375 America series. It has several unique features including Grand Prix-style three-eared knockoff hubs on Borrani wire wheels. Many of the Pinin Farina styling cues presage the later 410 Sport and even the 250 GT Spyder California. It was the final example built and the only one built for street use. King Leopold was so delighted with this Ferrari (chassis number 0488AM) that he showed it off to an admiring crowd at his 'local' Belgian circuit, Spa Francorchamps.
The king retained the car until 1960. After several additional Belgian owners, it was acquired by its current owner in 1969. The car was treated to a restoration in the early 1980s. In was given another restoration in the late 2000s and made its restoration debut at the 2012 Pebble Beach Concours d'Elegance.