The Queen may be extremely busy with various royal engagements, duties and responsibilities, but there's one hobby that she's always made time for.
While she's been known to ride horses and take part in Scottish dancing, she also likes to collect stamps - and it's reportedly earned her a fortune over the years (£100 million, to be exact).
The Monarch has been collecting stamps for decades and she now has an extremely impressive private collection with several that are worth a pretty penny.
According to The Telegraph, the Mauritian stamp is not only the most valuable in her collection but it's one of the most prized in the world and was valued at a staggering £2 million back in 2002.
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It originally belonged to her grandfather King George V, who bought it at auction in 1904 for £1,450 at the time - equivalent to about £60,000 today.
The stamp went on display to the public in 2002 as part of a travelling exhibition to celebrate the Queen's Golden Jubilee.
Over the years, the Queen has built an impressive collection, which is said to fill about 300 albums and about 200 boxes, all stored in a vault at St James's Palace.
Queen Victoria’s second son, Prince Alfred, started the stamp collection in 1864.
He then sold it to his brother, the future King Edward VII, who in turn gave it to his son, King George V and it subsequently passed down to King George VI and finally to the Queen.
When the Queen took over the collection she decided to sell some of the "surplus to requirement" stamps at auction and used the cash to buy new additions.
According to the Telegraph, the pieces she sold were a huge hit with buyers back in 2001 and her 200 items made £750,000.
She spent £250,000 of the profit on a unique set of 10 Penny Blacks.
Royal expert Phil Dampier told The Sun that she loves to show them off to visitors when they come to see her at Buckingham Palace.
He said: "The Queen loves showing her stamp collection to visitors, say heads of state who stay at Buckingham Palace.
"It is one of her pride and joys, not only because she owns some of the world’s most valuable stamps, but also because she has built on a family treasure and feels she has done her father and previous monarchs who owned it proud."
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