The car was once part of a fleet used by the Nazi leader in his travels across Europe during the Second World War.

The midnight blue 770 K model car was locked away in a collector's garage in Bielefeld along with seven other vehicles used by Nazi leaders.

Michael Froehlich, a Duesseldorf car dealer, said he brokered the deal for the unnamed billionaire, who also bought the other vehicles in the collection.

Included among the collection was an identical Mercedes once owned by Joachim von Ribbentrop, the Nazi foreign minister who was hanged at Nuremberg for war crimes.

After the Second World War the car travelled the world, first going to Austria, then to a car museum in Las Vegas, then back across the ocean to a brewery tycoon in Munich and finally to the anonymous collector in the British army garrison town of Bielefeld.

Mr Froelich turned up the car's original papers and repair logs and matched the licence plate number - 1A 148461 - to photos of Hitler in the car

Source: http://www.telegraph.co.uk/news/worldnews/europe/germany/6637693/Adolf-Hitlers-Mercedes-bought-by-Russian-for-5m.html