The most distinguished entry into the auto market is none other than Queen Elizabeth's classic dark green Bentley Mulsanne. This royal saloon comes at a steep price of a little less than £200,000, which is about $285,000.

Her Royal Majesty is said to have used this model for two brief years, the most notable public appearances being her Diamond Jubilee celebration and her visit to 10 Downing Street to attend her first cabinet meeting with Prime Minister Cameron during the British government's diamond jubilee.

Clocking only 5,826 miles on the odometer, the royal ride comes in pristine condition. The luxurious model was built for the Queen's exclusive use and registered at the Crewe Bentley headquarters.

Inside, the embroidered headrests adorn a cream leather upholstery with a Burr Walnut finish. It also has a built-in satellite navigation system, a veneered full air-conditioning system, driver information system and additional features such as picnic tables and a rear vanity mirror.

Under the hood, there is a 6.75-liter V8 engine that can generate 505 horsepower and 752 pound-feet of torque. With an eight-speed automatic gearbox, the machine can reach 60 mph in 5.1 seconds, before zooming to its maximum speed of 184 mph. The optional 21-inch alloy wheels add a smooth touch.

"What makes this Bentley particularly stand-out is that it was reserved exclusively for use by her Majesty and it has gone on sale in the year the Queen celebrates her 90th Birthday," as pointed out by Auto Trader's Karolina Edwards-Smajda.

"Auto Trader has a long tradition of advertising unique and famous cars including recently Victoria Beckham's own Range Rover Evoque, but few come with such Royal pedigree as this Bentley Mulsanne limousine," Edwards-Smajda said.

Royal rides evidently don't come cheap, and the future proud owner of this piece of history on wheels must not forget to reset the navigation set's extraordinary home address to something more ordinary.