We thought the Porsche 959 Komfort was rare, but this is the second model in as many months we have seen headed for the auction block. Are owners cashing in on a car that has long been considered one of the greatest Porsches ever? Perhaps, but even if the new owner has to pay the $1 million - $1.3 million Sotheby's expects it to sell for in next week's auction, they will have a timeless classic on their hands. The price of this eighties supercar is only going one way.

One of just 337 ever made, the Porsche 959K boasts a 2.85-liter twin-turbo six-cylinder engine rated at 450 hp. Combined with an advanced all-wheel-drive system, the 25-year-old supercar can sprint to 62 mph in a blistering 3.5 seconds. The car lived in Spain for 20 years before moving to the US in 2011, where it's current owner has kept it in a climate-controlled garage and spent $40k on a major service. With just 21,000 km on the clock, this is a unique opportunity to own one of the most sought-after Porsches on the planet.