In early Mercedes-Benz history, the "S-Class" designation was used colloquially, typically referring to the largest and most spacious luxury, or “Special Class” vehicle in the company's lineup. In some cases, it also applied to vehicles requiring premium fuel or also due to the higher compression ratio and output of the company's top-of-the-line engines. The 220S introduced in 1956 featured an upgraded 2.2-liter engine, unitized body/frame construction and fully independent suspension. Nearly every interior surface of the coupe and cabriolet was covered in leather or wood, and matching leather luggage was available. Presented in an elegant color combination of dark blue exterior with a black top and tan upholstery; this S-Class lives up to its reputation. It is a Texas car that has been garage kept and fastidiously maintained by proper stewardship.