1951 Cadillac Series 62 Custom Royal Parade Convertible

This custom 1951 Cadillac Series 62 Royal Parade convertible is powered by its 331ci OHV V-8 engine and heavy-duty four-speed Hydramatic automatic transmission. Built by General Motors at the Cadillac factory as a one-off parade car for Her Royal Highness Princess Elizabeth prior to her accession as Queen Elizabeth II in February 1952, it was provided to the princess by General Motors Canada for her 1951 Canadian Royal Tour. The car is equipped with power steering, power windows, power-adjustable front seats, an enlarged radiator for slow-speed parade use and a factory-installed four-barrel carburetor — one of only two 1951 Cadillacs built with this modification. An aviation company produced the custom clear convertible enclosure, providing weather protection while allowing occupants to remain visible during public appearances. The exterior is finished in black over a red Hydes leather interior. The car retains its factory-installed commemorative dash plaque documenting its royal heritage. Included with the sale is an invoice for the build, historical books and images showing the princess with the car, and an impressive silver and rhinestone replica of the George IV State Diadem that was commissioned in 1820 for King George IV and later became one of the most iconic crowns associated with Queen Elizabeth II. Completely restored to high-quality show standards, this one-off, historically significant Cadillac was commissioned specifically for use by the British Royal Family and was used by Princess Elizabeth during official royal parades in 1951.