For sale at auction: Lot #358.1 - 1969 Mercedes 6.3 German Factory Muscle Car. Rare 300hp (at the rear wheels) up to 1969 only 6.3 liter big block. Fastest production sedan in the world (143 mph top speed) in 1969. First car ever for "A.M.G." Only 6,526 cars made from 1967 to 1973. $40,000 mechanical and air suspension restoration, documented with photos and receipts. California car most of its life. Drive this car anywhere. 6.3 have finally been recognized for the special cars that they are.