The first "street sleeper" Mercedes-Benz created? I remember reading stories about owners who asked to remove the 6.3 badge to hide the car's real potential and fool other drivers...
Well...people will stop at the traffic light and wait...w/ his Ferrari 275 GTB for example; then a 300 SEL appears...they think "hah, I can beat Grandpa's car!" and when the light is green, Grandpa's car goes like a thunder, roaring from 0 to 60 mph in 6.5 seconds...leaving the Ferrari behind...and there you have the humiliation for the Ferrari and its owner