But for those looking to make a quick return it might to be time to look more closely.
A “very rare” 50p coin depicting the Battle of Hastings sold for £5,000 on eBay in April, despite the fact the design is listed as 50th on the changechecker.org scarcity list.
The scarcest pressing of the coins, which have an image of Kew Gardens on the back, haven’t fetched as much, sometimes selling for up to £160 on eBay.
Just 210,000 of Kew Gardens the coins were minted, according to the website, compared with 6,700,000 Battle of Hastings coins.
The site’s scarcity index lists rare 50ps which are distinguished by their unique designs, including ones that pay tribute to the NHS and historic figures such as Isaac Newton.
There are 59 coins on Change Checker’s index, and the top 10 typically sell for around 10 to 20 times their face value on eBay.
In a more modest sale, a London 2012 Olympics coin depicting the offside rule in football sold for £19 on eBay in February 2018.
The nine rarest coins after Kew Gardens all depict sports events such as tennis, judo, shooting and handball.
Football coins, the second rarest in circulation, are on sale on eBay for between £5 and £8.
The third rarest, which depicts the triathlon event from the 2012 Olympics, are listed on eBay for as much as £7.50.
Those lucky enough to have a pocketful of rare coins can make even more cash, with a collection of four 50p pieces made up of the triathlon, football, judo and wrestling designs selling for £36.
Beatrix Potter 50p coins are also highly-desired among collectors, with pieces depicting her character Jemima Puddle-Duck listed as the 19th most rare.
Pieces depicting Potter’s character Tom Kitten are the 25th most rare.
Sir Isaac Newton 50p coins, which entered circulation in September 2017, also feature in the scarcity index.
One of the coins is on sale on eBay for £3.89.