Originally created as a Group B rally car and later adapted into a road-legal version to satisfy FIA homologation regulations, the Porsche 959 is already one of the rarest models in the Porsche world. But now, you have the chance to get your hands on the rarest version of them all — if you’ve got the cash to back it up.

RM Sotheby’s is currently offering a one-off 1987 Porsche 959 “Speedster,” the only one of its kind. The history of this particular 959 began when it was sold to racing driver Jürgen Lässig, winner of the 24 Hours of Daytona in 1995 and runner-up at Le Mans in 1987. Unfortunately, it was involved in a crash on the Autobahn sometime in 1988. The damaged car was later acquired by Porsche driver and master craftsman Karl-Heinz ‘Charlie’ Feustel, who transformed it into what it is today.

The conversion process was certainly not rushed — it took around 4,000 hours to complete in Feustel’s specialized workshop located in a small village east of Cologne. Immense focus was placed on fit and finish, and Feustel gave the new owner the choice of either a soft top or a removable hardtop.

It still sports its original Grand Prix White paintwork and comes with its hardtop (stored in a transport case), a tonneau top, an interchangeable “Speedster” windscreen, spare door mirrors, and the original owner’s guides. A complete package for an absurdly rare machine — one that would make you stand out even among the already exclusive crowd of Porsche 959 owners.