There is no denying that the hardtop body style was a triumph of midcentury auto design. Depending on who you ask, the 1949 Buick Roadmaster Riviera coupe was the first regular-production hardtop of the post-war era. For General Motors, things got even more interesting when their designers turned to sedans.
For 1955, General Motors rolled out its first 4-door hardtops, with an example in all five of the makers brand lineups.
For those unaware, the hardtop body style is similar to a standard coupe or sedan, but does not include the central B pillar normally found aft of the front doors. The Pillarless look affords a given vehicle an open, airy, and unbroken silhouette. The hardtop body style was usually offered only on midline and top trim levels of a given model, and typically commanded a price premium over pillared examples.
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Though GMs 4-door hardtops were introduced for 1955, the maker began advertising the lot in single corporate ads for 1956. Its interesting to see Chevrolet, Buick, Pontiac, Oldsmobile, and Cadillac in the same print ad, its also really cool.
Cool, too, is the introduction of new hardtop trim-level name addendums which, for the most part, have stood the test of time. The 1956 Chevrolet hardtop was known as the Bel Air, The Pontiac as the Catalina, the Oldsmobile as the Holiday, the Buick as the Riviera, and the Cadillac as the de Ville.
As noted above, going with the hardtop added to the bottom line. While the least-expensive 1956 Chevrolet 4-door sedan started at $1869, going with the hardtop Bel Air would set shoppers back at least $2068; thats a hefty 11-percent price bump.
Though rare, GM would occasionally assemble cars from all of its divisions for a number of ads in the following years, possibly to the chagrin of brand marketing types looking for more-exclusive exposure.
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1956 General Motors Hardtop Sedans
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Favorite Car Ads: 1956 General Motors Hardtop Sedans
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1956 General Motors Hardtop Sedans
Chrysler first offered a 2 door hardtop in 1946. Kaiser Frazier first offered a four door hardtop in 1949-50. GM followed. I know because I owned those cars.