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WINDSOR, UNITED KINGDOM - JULY 26: Lady Diana Spencer, Before Becoming Princess Diana, At Guards Polo Club In Windsor. She Is Wearing A New Watch (as Well As Her Old Watch) And Gold Bracelet Which Were Birthday Gifts From Prince Charles. (Photo by Tim Graham Photo Library via Getty Images)

WINDSOR, UNITED KINGDOM - JULY 26:  Lady Diana Spencer, Before Becoming Princess Diana, At Guards Polo Club In Windsor. She Is Wearing A New Watch (as Well As Her Old Watch) And Gold Bracelet Which Were Birthday Gifts From Prince Charles.  (Photo by Tim Graham Photo Library via Getty Images)