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British Royalty, London, England, 12th May 1937, King George VI and Queen Elizabeth with Queen Mary and at the front their children Princess Elizabeth and Princess Margaret on the balcony at Buckingham Palace, after the Coronation ceremony at Westminster Abbey (Photo by Popperfoto via Getty Images/Getty Images)

British Royalty, London, England, 12th May 1937, King George VI and Queen Elizabeth with Queen Mary and at the front their children Princess Elizabeth and Princess Margaret on the balcony at Buckingham Palace, after the Coronation ceremony at Westminster Abbey  (Photo by Popperfoto via Getty Images/Getty Images)

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British Royalty, King George VI pictured when he was H,R,H, the Duke of York out riding with his daughter Pricess Elizabeth (later Queen Elizabeth II) and Pricess Margaret, 1938 (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

British Royalty, King George VI pictured when he was H,R,H, the Duke of York out riding with his daughter Pricess Elizabeth (later Queen Elizabeth II) and Pricess Margaret, 1938  (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

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The English princesses Elisabeth (r.) and Margaret in London after a children party. Photograph. March 7th 1939. (Photo by Imagno/Getty Images) Die englischen Prinzessinen Elisabeth (r.) und Margaret in London nach einer Kindergesellschaft. Photographie. 7.3.1939.

The English princesses Elisabeth (r.) and Margaret in London after a children party. Photograph. March 7th 1939. (Photo by Imagno/Getty Images) Die englischen Prinzessinen Elisabeth (r.) und Margaret in London nach einer Kindergesellschaft. Photographie. 7.3.1939.

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April, 1940, The Queen Mother, as Queen Elizabeth, and her daughter, Princess Elizabeth (later Queen Elizabeth II), at Royal Lodge, Windsor, Berkshire during World War Two (Photo by Popperfoto via Getty Images/Getty Images)

April, 1940, The Queen Mother, as Queen Elizabeth, and her daughter, Princess Elizabeth (later Queen Elizabeth II), at Royal Lodge, Windsor, Berkshire during World War Two  (Photo by Popperfoto via Getty Images/Getty Images)

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Windsor, England, April 1942, Princess Elizabeth and Princess Margaret prepare to set off for a bicycle ride at Windsor Royal Lodge (Photo by Popperfoto via Getty Images/Getty Images)

Windsor, England, April 1942, Princess Elizabeth and Princess Margaret prepare to set off for a bicycle ride at Windsor Royal Lodge  (Photo by Popperfoto via Getty Images/Getty Images)