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UNITED KINGDOM - JANUARY 01: Prince Charles With A Friend (believed To Be Camilla Fane) At Polo At Smith's Lawn Windsor Circa Late 1970s (Photo by Tim Graham/Getty Images)

UNITED KINGDOM - JANUARY 01:  Prince Charles With A Friend (believed To Be Camilla Fane) At Polo At Smith's Lawn Windsor Circa Late 1970s  (Photo by Tim Graham/Getty Images)