The Signature Series was the mid-level, and also most popular, trim level from 1981 through 2003. Starting in 2008 and through the end of the model run, the Signature Limited and Signature L were the only retail trim levels available. In 20, a Designer Series was added to fit in between the mid-range Signature Limited and the top-of-the-line Signature L. In 2005, however, the lineup was changed again and all three trim levels carried a Signature badge: Signature, Signature Limited, and Signature L. This left the Signature Series as the entry level model. In 2004, the Cartier name was dropped and replaced by Ultimate, and the Executive Series name was now only used for fleet vehicles going forward. In 1991, the Executive Series became the designation for the base/entry model. In 1981 the Town Car was introduced in three trim levels: the base model, the mid-range Signature Series, and the top-of-the-line Cartier Series.
