Comin gto the world's 6th most expensive car at auction.It's the 1937 mercedes benz540 k special roadster. 
Introduced at the 1936 Paris Motor Show, the Friedrich Geiger designed car was a development to the 500K, itself a development of the SSK. Available as a two seater cabriolet, four seater coupé or seven seater limousine with armoured sides and armoured glass, it was one of the largest cars of the time.

The straight-8 cylinder engine of the 500K was increased to 5,401 cubic centimetres (329.6 cu in), which aspirated by twin pressurized updraft carburetors, developed a natural 115 hp (86 kW). However, there was an attached Roots supercharger which could either be engaged manually for short periods, or automatically when the accelerator was pushed fully to the floor. This increased power to 180 hp (130 kW), creating a top speed of 170 kilometres per hour (110 mph).

4-speed or optional 5-speedmanual

This old lady cracked a huge amounts at the auctions. It cracked a record price of about $9.68Million.