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SNETTISHAM, UNITED KINGDOM - FEBRUARY 06: Queen Elizabeth II Smiling On The Actual Day Of The 40th Anniversary Of Her Accession To The Throne On The Death Of Her Father King George Vi. The Queen Is Wearing A Diamond And Amethyst Brooch Which Is One Of Three Brooches From The Kent Demi-parure, The Oldest Set Of Jewels In The Royal Collection Being Owned Originally By Queen Victoria's Family. (Photo by Tim Graham Photo Library via Getty Images)

SNETTISHAM, UNITED KINGDOM - FEBRUARY 06:  Queen Elizabeth II Smiling On The Actual Day Of The 40th Anniversary Of Her Accession To The Throne On The Death Of Her Father King George Vi.  The Queen Is Wearing A Diamond And Amethyst Brooch Which Is One Of Three Brooches From The Kent Demi-parure, The Oldest Set Of Jewels In The Royal Collection Being Owned Originally By Queen Victoria's Family.  (Photo by Tim Graham Photo Library via Getty Images)