Tiny overlooked error on your 20p could make it worth £72 – do you have one?

THIS minuscule mistake connected your 20p could gain you a whopping £72.

A manufacturing mistake by the Royal Mint successful 2008 meant that lone astir 250,000 coins were printed with this unsocial error.

The lucrative 20p portion is known arsenic a "mule" coin, released into circulation successful 2008 aft a manufacturing error.

Traditionally, coins would beryllium dated connected the "tails" side. But successful 2008, the Royal Mint decided to determination the day to the "heads" side.

However, a minting mistake caused a tiny fig of 20p coins to beryllium released without immoderate day connected astatine all.

This was the archetypal clip successful 300 years that British coins were released into circulation with nary day connected them.

As a result, the coins person become much much valuable than they are worth.

On an eBay auction, the uncommon 20p portion attracted a whopping 52 bids, yet selling for £72.

The fortunate purchaser besides needed to wage £7.95 for Royal Mail Special Delivery to support the invaluable coin safe.

The seller simply wrote successful the statement of the 20p: "Nice coin."

There are said to beryllium 250,000 20p coins minted successful November 2008, each with nary day on.

The rarity of these mules means that they are sought aft by galore coin collectors, arsenic good arsenic different radical conscionable funny successful them arsenic a curiosity.

The Britannica Coin Company website lists a azygous specified mule arsenic being for merchantability for £100.

This is acold from the lone uncommon coin to beryllium worthy overmuch much than its look worth would suggest.

What different uncommon Royal Mint coins are successful circulation?

This undated 20p portion isn't the lone uncommon - and invaluable - coin successful circulation.

The rarest is the Kew Gardens 50p, which was minted to people the 250th day of the gardens successful West London.

There were lone 210,000 of these collectors' point minted and tin merchantability for implicit £140.

Other uncommon British coins see peculiar variation 50p coins minted for the 2012 Olympic Games.

Only 1.1 cardinal of these constricted variation coins were minted, with immoderate selling astatine auction for implicit £10.

There person besides been coins to observe British books, specified arsenic a Sherlock Holmes 50p coin and a Peter Rabbit coin.