was adopted by Panther-chassis Ford and Mercury vehicles for 1981. Body As the Mark V remained throughout its production, much of its sharp-edged design played a role in the design of the downsized Panther-platform Lincolns. While the hardtop roofline of the two-door was replaced by a fixed B-pillar (with framed door glass), the Mark VI two-door shared a similar roofline with its predecessor; the four-door shared its roofline with the Lincoln Town Car (distinguished by oval opera windows). In line with its flagship model status, the Mark VI had more ornate styling than the Lincoln Town Car, including hidden headlamps, fender vents (non-functional), C-pillar oval opera windows, and forward-sloping taillamps; the Continental tire trunklid returned nearly unchanged from the Mark V. The Mark VI also was one of the first cars seen with several features commonly seen today; it came with the all-new Keyless Entry System, digital instrumentation (VFD), and trip computer. Also, it was the first year for the EEC III engine management system which kept fuel economy high and emissions low, an industry first. As an unusual option, the Mark VI offered "touring lights", which mounted low-power lights on the hidden-headlamp doors. The touring lights were turned on when the headlight switch was in the parking light position. While giving a soft glow, they did not provide sufficient light to drive in dark conditions and did not function as daytime running lights. This generation was also installed with Ford's "Auto Lamp" feature, and if the system was active, the touring lights would not be used when the conventional headlights came on (stowing the touring lights). Each Mark VI was also equipped with parking lights integrated with the front turn signals, so the addition of the optional touring lights was a styling flourish. Trim Alongside the standard Continental Mark VI, two additional trims were offered within the model line, including the Designer Editions and the flagship Signature Series. Signature Series For 1980, the Signature Series was available in both coupe and sedan formats. Intended as a successor to the 1979 Collector's Series option package, the Signature Series included nearly every available feature as standard equipment. The option was offered with either burgundy or silver exteriors; all vehicles came with a red interior (leather or velour upholstery). When first introduced in September 1979, final cost could exceed $24,000 USD (). Unique features included a rechargeable glove box flashlight, special seat