The Mercedes-Benz S-Type was based on the prior 400 and 630 models which had been given their names based on the displacement size of their engines. The 630, benefitting from improvements by Ferdinand Porsche, resulted in the 680S. Larger engines soon followed, resulting in the 700SS and the 710SS. Though they had been intended for road use, they were nearly identical to the SSK and SSKL racers. Many of the cars were constructed of aluminum to help reduce the overall weight. In 1928 the Mercedes SSK was introduced. (Super Sport Kurz), 700 or 710 versions. The chassis was about 19 inches shorter. The final series was the SSKL, a lighter, more powerful car The bodywork on these cars was mostly handled by the factory but often outfitted by European and American coachbuilders such Murphy and Barker. Produced from 1928-32, between 31 and 35 examples were built with around half being factory-designated Rennwagens, or race cars. Engine; 250hp 7100cc supercharged 6 cyl