Before McLaren began manufacturing their own supercar, they collaborated with Mercedes-Benz and came up with the 600-plus horsepower McLaren Mercedes SLR. A limited number of cars went on sale in the first half the previous decade. A later iteration of SLR was a special edition called the SLR 722 Edition.

It was named "722" as a tribute to Stirling Moss' Mercedes 300 SLR no.722 that won the 1955 Mille Miglia. They also made roadster based on the 722 Edition. In 2009, a limited-run 722S made its debut. Only 150 units were ever produced. One of them is now up for sale in the U.K.

The current ownquoting $493,000 (approx. as per current exchange rates). The car's run just 845 miles and is one of just 150 examples making it among the prized selections

Click past the jump to read more about the Mercedes McLaren SLR 722S

Mercedes McLaren SLR 722S

At the time when the SLR supercar was conceived, Mercedes-Benz owned 40 percent stake in McLaren. The exterior of the SLR was an intricately designed carbon fiber job. The car was designed to look like a shark and that's where the gills on the sides come from.

It was built as a grand tourer to rival likes of the Ferrari 599 GTB and Aston Martin DBS among others. The butterfly doors and the side exhausts were some of the highlights of the SLR's exterior design.

The interior however was a slight let down. The interior was too much like the Mercedes-Benz SL500. The dashboard was lifted straight from the SL roadster. Apart from the different trim, the rest of the interior including the instrument cluster was reminiscent of the SL roadster.

Under the large expansive hood was a 5.4-liter Supercharged V-8 that developed 617 horsepower in the standard SLR 722. The 722S however, got an uprated V-8 with 640 horsepower and 600 pound-feet. Give it a boot full and the engine made a sound like a crude oil fueled M2 Browning 0.50 caliber machine gun.

The Mercedes SLR 722S could reach 60 mph in just 3.6 seconds and had a top speed of 208 mph.