The iconic Silver Arrow was driven to victory by home hero Juan Manuel Fangio at the 1955 Buenos Aires Grand Prix, and then to the fastest lap at the Italian Grand Prix later that season by Stirling Moss.
The streamliner – chassis number 00009/54 – is one of only four ever made, and is the first of the quartet to go into private ownership.
Before Saturday’s auction – hosted by RM Sotheby’s at the Mercedes museum in Stuttgart – the car was owned by the Indianapolis Motor Speedway Museum, who initially received the machine as a donation from Daimler-Benz AG in 1965.