The Eldorado model was part of the Cadillac line from 1953 to 2002. The Cadillac Eldorado was the longest running American personal luxury car as it was the only one sold after the 1999 model year. Its main competitors included the Lincoln Mark Series and the lower-priced Buick Riviera and Oldsmobile Toronado.
The Eldorado was near the top of the Cadillac line during the early part of its existence. In fact the original 1953 Eldorado convertible and the Eldorado Brougham models of 1957–1960 were the most expensive models that Cadillac offered those years, and the Eldorado was never less than second in price after the Cadillac Series 75 until 1966.
Source: Wikipedia, 2012