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If you purchased a coin from the Royal Mint circa 2009, there's a chance you could be sitting on a small fortune today.
A rare 50p coin celebrating the 250 year anniversary of the opening of Kew Gardens recently sold on eBay for £186 - and you too could have one.
The coin - which features the Chinese Pagoda, one of the garden's buildings built in 1761 - went on sale in 2009 for around £30.
Only 210,000 of the coins were released into circulation, making it one of the rarest in existence - AKA, a coin collector's dream.
In fact, the Kew Gardens coin tops Change Checker's scarcity index which ranks coins based on their rarity.
The list calculated scarcity using a combination of mintage, collecting and swapping data to give "the most up-to-date picture of today's 50p coin collecting market."
Making up the top five are all coins from the 2017 London Olympics: Football, Triathlon, Judo and Wrestling.
While eBay seller chrisrandles2010 won big with his 'Genuine Rare Kew Gardens 2009 50p Coin - Very Good Circulated Condition' listing, pocketing £186, other Kew Garden coins have fetched between £110 and £150.
Coins that are in mint condition are far more valuable than those that have been used.
If you think you have one of the Kew Garden 50ps, Royal Mint can verify it's not fake and give you a letter of verification which you can put alongside your listing.
Other rare coins in Change Checkers index include the Jemima Puddle-Duck, Beatrix Potter and Mrs. Twiggy-Winkle coin, while many others honour sporting events.
There really is no limit to how many you could collect... Happy coin hunting!
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