If you’re planning any abroad trips this summer, you could make yourself a pretty penny by taking a closer look at the change you have left in your wallet when you’re home.
If you happen to have one of these particularly rare coins, you could make yourself thousands of euros by selling it online.
Even if you’re staycationing in Ireland this year, the likelihood of coming across one of these coins is still high considering the free movement of the EU currency.
READ MORE: The random household items that are worth a fortune - from cereal boxes to board games
So, if you’re just back from abroad, or come across an odd-looking coin at home, compare it to the following and see if you could be in the money.
Italian 1c coin - €6,000
In 2002, the Italian institute producing coins passports, and postage stamps - the Zecca di Stato - accidentally stamped a few thousand 1c Italian coins on 2c blanks.
These "fault error" coins featured Turin's Mole Antonelliana on the back, as opposed to the 13th-century citadel Castel del Monte in Puglia that typically was inscribed on the reverse.
Though Italian authorities attempted to recall the coins, some of them are thought to remain out there to this day.
There have even been a number that found their way onto the auction block where coin collectors bid thousands for them.
In an auction in 2013, one of these rare coins sold for €6,600, even though the bidding began much lower, at €2,500.
Greek €2 with a twist - up to €1,000
Although this coin is not considered to be rare - with over 75,000,000 in circulation - some feature a twist that can see them fetch up to €1,000 online.
Though the coins are Greek, a select few were in fact minted in Finland, and are therefore inscribed with a small star on the bottom with an ‘S’ in the middle.
This small detail drives up the value of the coin for collecting enthusiasts, with some willing to shell out four figures for just one coin.
Another Finnish coin worth a pretty penny
Finland joined the EU in 2004 and to mark the event, they decided to produce a commemorative coin.
Only one million of these coins are thought to be in circulation, meaning that they can now sell for around €80 on auction sites.
The Grace Kelly coin
In 2007, Monaco produced a limited edition €2 coin featuring the profile of its former Princess, Grace Kelly - commemorating the 25th anniversary of Kelly’s death in a tragic car accident in 1982.
Only 20,001 coins were produced in total, 20,000 for distribution and one that was gifted to her son, Prince Albert II of Monaco.
It is the smallest circulation of any commemorative €2 coin produced between 2007 and 2014, and each was sold for €120 at the time.
Though the price was deemed steep, anyone who managed to get their hands on one can now sell the coin for almost €4,000.
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