Bonhams London is holding an auction Saturday that will feature several of the vehicles previously owned by members of the British royal family. The international auction house plans to auction Queen Elizabeth II's Bentley, Princess Margaret's Rolls-Royce, and the family's 1968 Land Rover Series IIA at Goodwood Revival, an annual three-day festival featuring mid-century road racing cars and motorcycles.

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Bonhams
A 1968 Land Rover Series IIA previously owned by the British royal family.

The Queen's car is estimated to be worth between $190,000-$216,000 and Princess Margaret's vehicle is about $84,000-$108,000 dollars, Bonhams spokeswoman Poppy McKenzie Smith told HarpersBAZAAR.com.

The Queen's 2012 Bentley Mulsanne Saloon was used primarily for formal occasions, such as when Her Majesty attended a Cabinet Meeting with former Prime Minister David Cameron.

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Bonhams
Queen Elizabeth II\'s 2012 Bentley Mulsanne Saloon.

Princess Margaret's Rolls-Royce Silver Wraith II has features unique to a vehicle previously owned by a royal, including a mount for the Standard Pennant, Royal Crest mountings, police lights and a raised rear bench seat that enabled the Princess to be easily seen through the windows.

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Bonhams
Princess Margaret\'s Rolls-Royce Silver Wraith II.

But the coolest thing about the car? It was once loaned to Princess Diana and former U.S. President Ronald Reagan and his wife Nancy, a Bonhams press release states.

Smith said The Queen will be not be present at the auction, since the cars are sold through a private collection. "Once the royal family have decided that they no longer need their cars, they are decommissioned and sold privately," she added.

Several security features are removed before the vehicle is returned to the manufacturer, but one specification that was seemingly overlooked this time was the Bentley's navigation system. "The most unusual feature is the fact that on the Queen's Bentley, when you press 'home' on the satellite navigation, it directs you to Windsor Castle!" Smith said.

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Bonhams
The interior of The Queen\'s Bentley.
From: Harper's BAZAAR US