Introduced in April 1968 as an early 1969 model, the Continental Mark III is the direct spiritual successor of the limited production, ultra-luxurious Continental Mark II produced by a short-lived Continental division of Ford Motor Company between in 1956 and 1957.
Confusingly, a direct linear descendent of the Mark II, the Continental Mark III, first wore the name in 1958. Large and somewhat extravagant even for its time, it did not sell as well as Cadillac, but nonetheless earned high reviews from motoring periodicals of the day. The 1958 Mark III was the first car to be built at the new Wixom, Michigan assembly plant.
Intended to compete head-to-head with Cadillac's heavily redesigned front wheel drive Eldorado, the Mark III made its debut a clear notch above less expensive, less well-appointed personal luxury cars such as the Ford Thunderbird, Buick Riviera and Oldsmobile Toronado. As the Eldorado was built upon the Toronado frame, so the Mark III was the Thunderbird's. While the side-rail frame was identical to the Thunderbird's, the Mark III bore almost 300 lb (140 kg) more bodywork. demanding all the power Lincoln's all-new 460 cu in (7.5 l) 365 bhp (272 kW) V8 could generate.
In style, the Mark III was squarer and more upright than the sleek Thunderbird, featured a Rolls-Royce like grill, hidden headlights, and a classic albeit ersatz Mark II spare tire bulge on its trunk.
As befitted a true luxury car the Mark III was sumptuously equipped. Everything was power: steering, brakes, windows, headlamps, and both front seats. The instrument panel and trim panels on the doors featured simulated wood appliques in either English Oak or East-Indian Rosewood. After a few months, a Cartier-branded clock took pride of place among the instruments. The upholstery was expertly done, either the standard vinyl with cloth inserts, or the optional leather.
A vinyl roof in cavalry twill pattern was technically an option, but they were so popular that a plain-roofed car is the rarity. One reason for the rarity of the plain-roofed version is the fact that the roof was made in two pieces and required extra preparation at the factory to conceal the seam; consequently, its availability was not widely advertised. Other options included the aforementioned leather interior, air conditioning, further power adjustments for the front seats, a variety of radios and 8-track tape players, tinted glass, power locks and all the rest. A limited slip differential could be ordered, as could anti-lock brakes, called "Sure Trak". Cruise control was also an option. Finally, an automatic headlamp dimmer that dimmed the headlights for oncoming cars without driver intervention was available. Full instrumentation could be ordered.
Despite some bad reviews by the automotive press, the public took to the car, with some 7,000 built during the remainder of the 1968 model year, and another 23,858 cars for the 1969 model year, a respectable showing; Lincoln had always trailed Cadillac in production numbers, but the Mark III almost equalled the Eldorado, which tallied 23,333 for 1969. This was the start of a long, successful run for the Lincoln Continental Mark Series.
Because of its early introduction and extended production year, the 1969 model had several running changes made. Cars produced prior to July 1968 had a steering wheel pad with a much larger wood applique and Continental star logo than later cars. Cars produced prior to July 1968 featured a decorative stitching pattern on the face of the rear seat above the center arm rest. After July 1968 the seatbelt retractors were relocated and eight additional exterior color choices were added. Cars produced before the second week of December 1968 had white indicator needles for all instruments and controls, and an electric clock with Arabic Numerals was used. Cars Produced after the second week of December 1968 utilized orange indicator needles for all instruments and controls, and a Cartier Chronometer with Roman Numerals was installed. All cars produced after December 31, 1968 were equipped with driver and front passenger head rests per Federal mandate.
There were only small changes for 1970 as Lincoln saw no need to break a clearly winning formula. 21,432 were sold; somewhat down from the previous year. The vinyl roof was made standard, since at the time, nobody seemed to want to order a luxury car without it, the windshield wipers were now hidden from view, and the wheel covers were redesigned. Michelin radial tires were standard equipment (a first for an American car), and a locking steering column/ignition switch replaced the dash-mounted switch per federal mandate. The metal horn ring used in '69 was deleted from the steering wheel, replaced by a Rim Blow unit. Increasingly stringent Federal safety requirements mandated the addition of red reflectors to the rear bumper, and yellow reflectors to the sides of the front parking lamp assemblies. Although horsepower remained unchanged at 365, Federal emissions requirements were met by the installation of Thermactor air injection pumps on the 460 cid engine. The interior wood appliques were upgraded to genuine Walnut. The door panels were redesigned and the power seat controls were moved from the seat edge to the door arm rests. The pattern of the stitching on the seats was modified. A power sliding sun roof joined the options list.
Motor Trend’s 1970 head-to-head review of the Eldorado vs. the Mark III gave the nod, barely, to the Mark III, beginning an annual "King of the Hill" series that ran for years.
1971 saw the Golden Anniversary for the Lincoln marque, and the third and final year of Mark III production. Sales were better than ever, at 27,091 almost equal to the Eldorado's, a harbinger for the new decade.
Little changed from the 1970 model; tinted glass became standard, as did automatic climate-controlled air conditioning and SureTrak anti-lock brakes. High-back seats became standard, and a rare special-order floor console was made available. Horsepower remained unchanged at 365, but the 460 cid V8 engine gained a more sophisticated thermostatic air cleaner assembly with its associated ductwork.
In its second annual King of the Hill contest Motor Trend (July, 1971) again gave the Continental Mark III the nod by a wider margin than 1970 despite the Lincoln being basically a warmed over 1968 model while the Cadillac was all-new from the ground up. M/T noted that the Mark III's leather interior was far more luxurious and better detailed than the test Eldorado's nylon cloth and the Continental's real wood dash trim was far more attractive than the Cadillac's simulate.
1972 would see a new, even larger car, the Mark IV, replace the Mark III.