The Ford Thunderbird was a car manufactured in the USA by Ford and entered production as a two-seater sporty car in 1955. Unlike the Chevrolet Corvette, the Ford Thunderbird was never sold as a full-blown sports car.
Ford positioned the car as an upscale model, and is credited in developing a new market segment, the personal luxury car. In 1958, the car was produced with a second row of seats. Succeeding generations became larger until the line was downsized in 1977 and again in 1980, and once again in 1983.
Sales were good until the 1990s, when large 2-door coupes became unpopular; production ceased after 1997. In 2002, a revived 2-seat model was launched, which was available through the end of the 2005 model year.
Source and more info: Wikipedia.
What's it worth? Take a look at this Ford Thunderbird price guide: sold listings for a value indication.