People are being urged to check their purchases and down the sides of their couches for 50p coins that could be worth hundreds.

The Royal Mint has listed the rarest fifty-pence coins, with the most valuable coming in at £650. There are 200million 50p coins circulation the UK alone, with the rarest being the most valuable. The lower the mintage figure, the less coins in circulation, which in turns mean they are worth more.

Many of the coins in question were minter to commemorate a special occasion - whether it be a sporting or historic events - reports The Mirror. The Kew Gardens coin for example was released in 2009 to mark 250 years since the famous garden opened in 1759.

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Other coin designs include Harry Potter and the triathlon, which was released to mark the beginning of the 2012 Olympic Games in London. And there are some coins that are highly sought after by collectors, boosting their value even more.

Coins of interest are often sold online for quite a lot of cash, so it may be worth checking if you any of the 50ps listed below - the top 5 most valuable on eBay - lying about your house...

Triathlon - worth £16

The Triathlon 50p was released to mark the opening of the 2012 Olympic Games
The Triathlon 50p
  • Mintage: 1,163,500

The Triathlon 50p was introduced in 2011 and 1,163,500 in total were made.

The Royal Mint circulated unique 50ps depicting the sport featuring in the upcoming 2012 Olympic Games in London.

One of the highest bids found on eBay for the 50p is £16.

Judo - worth £18

The coin was also minted ahead of the 2012 Games
The 2011 Olympic Judo 50p coin
  • Mintage: 1,161,500

This coin was also minted in 2011 ahead of the 2012 Olympics.

David Cornell's design won a competition that saw his creation printed on 1,161,500 50ps.

One of the highest bids we've seen on eBay was for £18.

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Wrestling - worth £14.50

It has been seen on eBay for up to £14.50 online.
Wrestling coin
  • Mintage: 1,129,500

This 50p coin was designed by Roderick Enriquez, a graphic designer from Hammersmith, London.

It has been seen on eBay for up to £14.50 online.

Football - worth £20

There are not many in circulation
This is one of the rarest
  • Mintage: 1,125,500

This coin is one of the many minted to commemorate the 2012 Olympics, but this one is the rarest.

The 50p Football includes an explanation of the offside rule on it.

In August, one sold for £20.

Kew Gardens - worth £650

The Kew Gardens coin was minted in 2009
This one is worth hundreds
  • Mintage: 210,000

The Kew Gardens 50p is the rarest of all the 50p coins.

In the past, it has sold for thousands and one listing shows one sold in September for £650.

It has an incredibly low mintage score of 210,000 and was created by Christopher Le Brun RA. It features the Chinese Pagoda with a leafy chamber that twists around the tower.

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