The 1953 Eldorado was a special-bodied, low-production convertible (532 units in total). It was the production version of the 1952 El Dorado "Golden Anniversary" concept car

Concept car

A concept vehicle or show vehicle is a car made to showcase new styling and or new technology. They are often shown at motor shows to gauge customer reaction to new and radical designs which may or may not have a chance of being produced....

, and borrowed bumper bullets (aka dagmars) from the 1951 GM Le Sabre

Le Sabre concept car

The General Motors Le Sabre was a 1951 concept car. Possibly the most important show car of the 1950s, it introduced aircraft-inspired design elements such as the wrap-around windshield and tail fins, which became common on automotive designs during the second half of the decade.-History:The Le...

 show car. Available in four unique colors (Aztec Red, Alpine White, Azure Blue and Artisan Ochre — the latter is a yellow hue, although it was shown erroneously as black in the color folder issued on this rare model).