An unused Mercedes-Benz CLK GTR Roadster manufactured in 1999 will be auctioned next month.

One of the only six cars ever made, this belongs to an unknown Dutch collector who purchased it as an investment as the car hasn't been driven at all. It's heading to the auction block set for June 26 at a Bonhams event during the 2015 Goodwood Festival of Speed sale where it's expected to fetch between £1.4 million to £1.8 million ($2.17M to $2.79M or €1.95M to €2.51M).

Its heart and soul is a mighty 6.9-liter V12 engine producing 612 PS (450 kW) and 775 Nm (572 lb-ft) which enables the Mercedes-Benz CLK GTR Roadster hit 62 mph (100 km/h) from a standstill in just 3.8 seconds before topping out at 199 mph (320 km/h).

Gallery: Unused 1999 Mercedes-Benz CLK GTR Roadster heading to auction block

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