Here are a few possibilities:
* American Muscle: The Chevrolet Bel Air was introduced in 1955, and is a classic American muscle car.
* European Luxury: The Mercedes-Benz 300 SL Gullwing was introduced in 1954, but production began in 1955, making it a true icon of European luxury sports cars.
* British Sports Car: The Austin-Healey 100 was introduced in 1953, but the 100M model with a more powerful engine was introduced in 1955.
* American Luxury: The Cadillac Eldorado was introduced in 1953, but the first generation Eldorado Biarritz convertible was introduced in 1955, making it a very special car.
Do any of these sound like the car you're thinking of? If not, please give me more details about what type of car you are looking for!