1957 Dual-Ghia Convertible

This was the product of a two-year joint venture between Italy's Ghia and Detroit's Dual Motor Co.
Between coupes and convertibles, a total of 117 units were built from 1956 to 1958. I've read that there's only 30 or so still in existence. Not sure if true or not 🤷‍♂️
Either way, they now going for roughly $300,000 - if you can find one for sale

1970 De Tomaso Mangusta

The Mangusta started as a collaboration between De Tomaso and Carroll Shelby. The object was to create a Can Am race car.
The project was abandoned when Ford approached Shelby to create a Ferrari beating car for Le Mans, which Shelby accepted.
De Tomaso then re-directed his team to use the work done to create a mid-engine GT street car, which resulted in the Mangusta

1980 Saab 99 Turbo

The 99 was the predecessor of the 900 although it continued to be built alongside its successor for several years.
Perhaps one of the prettiest cars ever to be considered a failure in automotive circles, at least from a commercial point of view

1972 Ford Pinto

The Pinto was the first sub-compact car produced by Ford in North America.

Its negative legacy stems from some gas tank fires and explosions that occurred when the car was rear-ended.

When Forbes included the Pinto in its list of "14 Worst Cars of All Time", it claimed that the Pinto's woes were partly responsible for creating an opening in the U.S. market for smaller cars from Japan

1974 AMC Matador X

AMC dipped its feet into the coupe segment with the Matador X. Like with most of its vehicles, it was a love-it-or-hate-it car