The 50p coin with a design of Kew Gardens on its face has been revealed as the rarest coin in circulation, with only 1 in every 300 people in the UK thought to have it in their change.
As a result, the commemorative coin is now being listed on eBay with a price of up to £120.
The Royal Mint unveiled the design in 2009 to celebrate the 250th Anniversary of the Royal Botanic Gardens.
But only 210,000 of the coins were released into circulation. This compares to 22.7million of the shield of the Royal Arms 50p design in 2008, and 7.5million of the Girlguiding 50p in 2010.
The Royal Mint is now encouraging people across the UK to check their change to see if have they have the "incredibly rare work of art" in their pockets.
Now that the coin has been announced as rare, it's expected to fast disappear as people hold on to it, hoping that its value will further increase.