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WINDSOR, UNITED KINGDOM - JULY 25: Queen Elizabeth II Driving Herself In Her Daimler Jaguar Car As She Arrives To Watch Polo At Smiths Lawn, Windsor. (Photo by Tim Graham/Getty Images)

WINDSOR, UNITED KINGDOM - JULY 25:  Queen Elizabeth II Driving Herself In Her Daimler Jaguar Car As She Arrives To Watch Polo At Smiths Lawn, Windsor.  (Photo by Tim Graham/Getty Images)