High Quality Content by WIKIPEDIA articles! In 2004, car maker Lincoln introduced two concept car models intended to fill the void left in the Lincoln line-up by the Mark Series which was discontinued in 1998. These models were the Mark X and MK9. Concerning the heritage of the Mark the Ford Motor Company press release states, "Throughout its history, Lincoln has used the Mark name to signal a truly special vehicle... the 1956 Continental Mark II... became a classic for its high quality... The 1969 Mark III was Lincoln's most successful new model at the time, selling more than 30,000 units." The Lincoln MK9 was a Lincoln concept car first showcased in 2004. The vehicle hinted at a future comeback of a Lincoln Personal luxury car. The MK9 was a follow-on vehicle from the 2003 Lincoln Navicross concept, with similar styling cues. The MK9 kicked off Lincoln's new naming convention of using letter and number combinations while hinting at a continuation of the Lincoln Mark series. While the naming system is similar to that of Mercedes-Benz or BMW, it does not contain any references regrading the vehicle's engine size or generation.