Kew Gardens 50p could be worth £120
If you've got a 50 pence piece with a picture of a tower and some leaves on it, it could now be worth £120 - a whopping 23,900% gain on the coin's face value.
The coin was created by Royal Mint in 2009, to coincide with the 250th anniversary of Royal Botanic Gardens at Kew Gardens. In mint condition, and in its original packaging, the coin is now worth a small fortune.
It's currently selling on eBay for up to £119.95, but the coin itself – without its packaging but in good condition - can still fetch around £24.
Royal Mint said the Kew Gardens 50p from 2009 is the rarest commemorative UK coin design in circulation.
Only 210,000 of the coins were ever released into circulation - that's just over 1 for every 300 people in the UK.
They feature Kew's famous pagoda encircled by a vine with the dates 1759 and 2009, designed by Christopher Le Brun.
Shane Bissett, director of commemorative coin at The Royal Mint, said: "Now that people know just how rare this particular coin is we expect them to disappear from circulation fast."
Do you have one in your wallet? If so, we'd love to see your photos. Send them to us at email@example.com.