was a feature in all series fixed-roof body-styles, (excluding wagons and convertibles). Oldsmobile also used this 3-piece rear window design that year, marketed as the “Twin-Strutted Rear Window.” Because the Century was considered the senior "small Buick", the model received a version of GM's hardtop station wagon, the Century Caballero Estate for the 1957 and 1958 model years and was not continued for 1959. For 1959, Buick renamed the Century the Invicta. Third generation (1973–1977) The Buick Century nameplate was revived for the 1973 model year on the rear-wheel drive intermediate A-body platform, which was redesigned for this year. The name replaced Skylark for Buick's mid-sized cars. The Century Regal coupe was added at the top of the model range and later became a separate series, dropping the Century name for 1976. It was available with two- and four-barrel versions of the Buick 350, putting out , respectively. The 455 was also an option. The base Century and Century 350 coupes had a fastback roof with large rear quarter glass, while the Century Luxus featured a more formal notchback roofline with narrow opera windows. The Century Estate replaced the Buick Sport Wagon. By replacing the Skylark, the Century inherited the Gran Sport performance option. The package was available with any engine and included upgraded suspension, additional instrumentation, and unique appearance treatment. Dual exhaust increased output of the four-barrel 350 to . While the Stage I 455 was somewhat diminished from its performance heyday due to emission controls, output was competitive for the era at and . A Saginaw three-speed manual was standard with either 350 engine. A Muncie M-21 four-speed was available with either 350 or with the regular 455, while the Stage I required a Turbo-Hydramatic 400. The 1974 Buick Century and Regal were introduced with HEI (High-Energy Ignition systems) instead of points and ignition coil. The 1974 Buick Century Gran Sport was still, "Available only as a Hardtop Colonnade Coupe, it carries the Rallye ride and handling suspension with stabilizer bars, front and rear. Plus a specialized blacked-out grille and head lamp doors, an accent stripe on the rear deck, special tail lamps and Gran Sport grille ornamentation. And if you go for the Gran Sport, you can add the Stage 1, the high performance engine." For 1975, the Luxus was renamed Century Custom. The new 231 V6 was installed as standard equipment along with a three-speed manual