An extremely rare example of one of the most iconic vehicles of the 1980s, the Ferrari Testarossa, is about to go up for grabs.

Next week, RM Sotheby’s will auction off a Testarosa Pininfarina Spider “Special Production” as part of its annual London sale. The gorgeous convertible is one of just seven examples built for the Brunei royal family and is likely to fetch a hefty sum because of that.

The Testarossa debuted in 1984 as the successor to the Berlinetta Boxer and would quickly become one of the defining supercars of the era. The Pininfarina-designed vehicle was in production for 12 years, during which time every single example that rolled off the line was a coupé except for a single convertible built for Fiat chairman Gianni Agnelli in 1986, according to the the auction house. There was demand for more, but Ferrari refused to put the model into production. Aftermarket firms, including Pininfarina, were willing to, though. That’s how this example came to be. It was one of seven commissioned by the royals in 1989, each of which featured a different exterior and interior color combination.