The Queen becomes the first monarch in British history to celebrate a sapphire jubilee
The record-breaking monarch, 90, will reach the milestone on February 6.
However, there are no plans for a public celebration and sources suggest the Queen will spend the day in “quiet reflection” at Sandringham.
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Although it is a happy occasion, the day provides a poignant reminder to the Queen of the sudden loss of her beloved father and predecessor King George VI.
His death on February 6 1952 hurried the 18-year-old Queen to the throne.
The Queen on 02 June 1953 after being crowned solemnly at Westminter Abbey in London
Royal sources suggest she will spend the day in “quiet reflection” at Sandringham.
To mark the occasion, the Royal Mint has cast special coins – including one worth £50,000.
The record-breaking monarch, 90, will reach the milestone on February 6
Queen Elizabeth II in pictures
Fri, January 27, 2017
Queen Elizabeth II making her Royal visits in her many colourful and elegant outfits.
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Queen Elizabeth looks towards a man dressed in traditional costume as she arrives to view an exhibition on Fiji at the Sainsbury Centre for Visual Arts, University of East Anglia in Norwich, eastern England
Five years ago the Queen became only the second monarch, after Queen Victoria, to reach 60 years on the throne.
That achievement was widely celebrated, with a 1,000 strong flotilla including Dunkirk ships and dragon boats parading down the River Thames to mark her Golden Jubilee.
The Queen also opened up the Palace gardens to thousands of picnickers, who were presented with special Jubilee hampers.