The Sergio car had been initiated by Pininfarina and is now managed by Ferrari - with all six having been pre-sold to Ferrari fanatics in Europe, Asia and the United States.
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But they aren't offered to just anyone. As Ferrari spokesman Jason Harris told The Independent, they "are only offered to our most loyal and passionate clients that have a long-standing relationship with the brand".
As reported by CNNMoney, buyers of the Sergio place their commitment to buying the finished product before the design has even been finalised.
Harris said: "Deliveries are expected in 2015 once the final road-going version has been defined for homologation."
Ferrari can create a "one-off" car for discerning customers, and the Sergio is classified as one of those despite there being six of them, however, it also creates limited edition cars such as LaFerrari, which can also be bought only with an invitation.
There are just 499 LaFerraris being made - a car which debuted at the 2013 Geneva Motor Show and where 1000 people had reportedly put in an offer to buy one, Wired reports.
• For more car news go to nzherald.co.nz/driven
One of the people that did strike an agreement with the Italian firm was Croatian businessman Robert Herjavec, who is said to have a buoyant number of Ferraris in his garage.
He told Wired that Ferrari is less interested in how much money someone has, than how impassioned they are as a fan of the brand.
"This is where the Ferrari world is kind of like the Vatican," he said. "It's very mysterious.
There are a lot of trinkets you have to wear, and a lot of rings you have to kiss."
-Independent
