1955 Mercedes SLR Uhlenhaut prototypes

The 1955 race car was numbered with 722 for the time of it's start on the 1955 Mille Miglia, when Sterling Moss won driving this particular race car. Stirling set the record that year for the fastest Mille Miglia, averaging about 100 mph, and no one since has beat that speed record

photos from http://www.supercars.net/cars/1201.html

The Mille Miglia, Targa Florio, Tourist Trophy, Eifelrennen and the Swedish Grand Prix - the 300 SLR won them all.

you might recognize the 722... it was given it's own very special and unique transporter. The Rennsporter

Initiated by Mercedes-Benz race manager Alfred Neubauer, who wanted a fast option of getting race cars to the circuit or back to the factory if necessary, the Prototype-Department created a hybrid between a sports car and a truck. http://justacarguy.blogspot.com/2007/06/one-unique-vehicle-transporter-of.html I recall reading that it had the same engine as the race car