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.
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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."
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The coin which honours the UNESCO World Heritage Site has the smallest mintage (just 210,000), is the least owned, and is the most requested swap - thus why it has its title.
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.
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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!
Featured Image Credit: eBay