Back in November last year, Princess Diana’s first official U.S. ride – a 1979 armored Rolls-Royce Silver Shadow was auctioned for charity, raising $122,322.

Another car, this time a 1994 2.5l Audi Quattro convertible owned by Princess Diana will be auctioned by COYS at their traditional sale at Blenheim Palace on June 29th.

The car is currently on display in London at the Grange St. Paul’s Hotel and according to Chris Routledge, Managing Director of COYS: “This is an extraordinary opportunity to own a piece of Royal History. We have put a guide price on the car of between £20,000 and £25,000 but we have no idea what it will go for.“

The car is in immaculate condition and has only 21,000 miles on the clock.