Last month, Lamborghini celebrated a new milestone after the 10,000th Aventador rolled off the production line. This isn't only milestone Lamborghini is celebrating, however, because one of the company's most under-appreciated sports cars has just turned 50. We're talking about the long-forgotten Lamborghini Urraco, a sports car you've probably never heard of.

Unveiled at the Turin Motor Show in 1970, the Urraco's design was innovative for its time. Taking the form of a 2+2 coupe, the Urraco featured a mid-mounted V8 rear engine and independent suspension, while the chassis was fitted with a MacPherson strut system on both front and rear axles for the first time in a production car.

Initally, the Urraco was powered by a 2.5-liter V8 delivering 220 hp, enabling the sports coupe to hit a top speed of 152 mph. Unusually for the time, the Urraco's eight-cylinder engine featured single overhead camshafts and a "Heron chamber" engine head enabling a higher compression ratio without increasing development costs. Another novelty was the four Weber double-body 40 IDF1 type carburetors. Its distinctive, wedge-shaped design was penned by Marcello Gandini, who was the principal designer for Carrozzeria Bertone at the time.

Measuring 13.9 feet long, the interior also had an unconventional dashboard and instrument layout along with a dished steering wheel.

Built between 1970 and 1976, the Lamborghini P250 Urraco used a 2.5-liter V8. Only 520 examples rolled off the production line. This was followed by the ultra-rare 2.0-liter P200 that generated 180 hp. Production was limited to just 66 examples for the Italian market between 1975 and 1977. And between 1975 and 1979, Lamborghini finally built 190 examples of the P300, which had a larger 3.0-liter displacement and 265 hp. The Urraco subsequently led to Lamborghini producing more eight-cylinder and ten-cylinder models, such as the Gallardo and the Huracan.