The three-door, 130-horsepower car is the definitive hot hatch, although its stealthy black paint with a blue pinstripe sets it apart from its sporty brethren. Regular go-faster RS Escorts came in all-white only.
Princess Diana could often be seen driving the car between 1985 and 1988 and was spotted around London or outside the boutiques of Chelsea and the restaurants of Kensington.
The young princes William and Harry were frequently in the back seat, with a plain-clothes detective on board for security reasons.
Ford's Special Vehicle Engineering department was tasked to paint the car and it fitted a regular five-slat front grille to assist in the stealth makeover.
The Escort also had a secondary rear view mirror for the protection officer with a radio in the glove box, the cable for which is still visible today.
The car was returned to Ford in May 1988 with some 11,000km on the odometer and it has still covered only 40,170km from new.
The Escort is being offered by Silverstone Auctions on Aug 27 at no reserve and will probably fetch at least six figures, owing to its connection to a still beloved public figure.
Diana, Princess of Wales, died from the injuries sustained in a car crash in the Pont de l'Alma tunnel in Paris, in the early hours of Aug 31, 1997.
