1939 was also the year of the 1939 New York World's Fair and the streamline appearance gave a futuristic look when it was on display at the Futurama exhibit.

Single die-cast louvers were positioned to the rear of each hood side panel for engine compartment ventilation.

In 1941, the one piece hood came down lower in the front, included the side panels and extended sideways to the fenders.

One was based on the notchback GM C platform which ended up being shared by the Cadillac Series 62, Buick Roadmaster and Super, the Oldsmobile 98 and the Pontiac Custom Torpedo.

[4] A second was based on the fastback GM B platform which ended up being shared by the Cadillac Series 61, the Buick Century and Special, the Oldsmobile 70 and the Pontiac Streamliner Torpedo.

A third was a modified notchback design, derived from the fastback B-body, but described as "A-body-like", that ended up being used by the Cadillac Series 63.

The grille became more massive in 1942, with even fewer bars and was the beginning of the traditional "egg crate" appearance that all future products adopted.

They featured General Motors first all-new postwar body with styling advances including tailfins inspired by the Lockheed P-38 fighter plane.

Cars in the 61 series lacked bright metal front fender shields and under-taillight trim.

A new dashboard with "rainbow" style instrument cluster and leather grained panels extending to the carpets was seen only this year.

They included a more massive grille treatment with grooved extension panels housing the front parking lights and chevron slashes below the taillamps on the coupes.

Once again the cars in this line lacked front fender gravel shields and rocker panel moldings and had plainer interior trim.

Standard equipment now included twin back-up lamps mounted on the deck lid latch panel.

Round parking lights were used, but as in the past, when buyers chose fog lamps an additional bulb and larger housing were used.

One piece windshields were introduced and the leading edge of the rear fenders which had a broken-off look, was highlighted by chrome imitation air slots.

A minor face lift and small trim variations were the main Cadillac styling news in 1951.

The features list included handbrake, warning lamp; key start ignition; steering column cover; Delco-Remy generator; knee-action front suspension; directionals; mechanical fuel pump; dual downdraft carburetor; slipper-type pistons; rubber engine mounts; oversize brakes; Super Cushion tires; one-piece windshield; intake silencer; 160-hp engine; oil bath air cleaner; equalized manifolding; automatic choke and luxury appointments.

On the dashboard "idiot lights" were used to monitor oil pressure and electrical charge rate instead of gauges.