Experts have highlighted the rare coin, which is still believed to be in circulation and features an error that makes it extremely valuable.

Experts have highlighted a rare coin, which is still believed to be in circulation and features an error that makes it extremely valuable.

Experts have highlighted a rare coin, which is still believed to be in circulation and features an error that makes it extremely valuable.

Coins marking 100 years since the start of the First World War are usually worth no more than £2 but one variety of the coin, featuring the face of Lord Kitchener, is now selling for hundreds of pounds.

Coins marking 100 years since the start of the First World War are usually worth no more than £2 but one variety of the coin, featuring the face of Lord Kitchener, is now selling for hundreds of pounds.

On some of the coins the words “Two Pounds” are missing on the head side of the coin.

On some of the coins the words “Two Pounds” are missing on the head side of the coin.

According to experts at Coin Hunter, 5,720,000 of these coins are still in circulation but it appears to be “very rare” to find one without a date.

According to experts at Coin Hunter, 5,720,000 of these coins are still in circulation but it appears to be “very rare” to find one without a date.

It isn’t clear exactly how many of coins with an error remain in circulation but the first of its kind sold in March 2020 for £500.

It isn’t clear exactly how many of coins with an error remain in circulation but the first of its kind sold in March 2020 for £500.

Coin Hunter experts said on Facebook: “Check your coins that feature Lord Kitchener.

Coin Hunter experts said on Facebook: “Check your coins that feature Lord Kitchener.

“If the heads side does not show 'TWO POUNDS' - you have an error that appears to be very rare.”

“If the heads side does not show 'TWO POUNDS' - you have an error that appears to be very rare.”

Royal Mint rarest coins from Queen Elizabeth II’s reign

Royal Mint rarest coins from Queen Elizabeth II’s reign

Here is a list of rare coins compiled by the Royal Mint, with information about the year of release, denomination, design features and whether or not the coin is still in circulation:

Here is a list of rare coins compiled by the Royal Mint, with information about the year of release, denomination, design features and whether or not the coin is still in circulation:

The rarest coins minted during Queen Elizabeth II's reign (Image: Royal Mint/PA)

The rarest coins minted during Queen Elizabeth II's reign (Image: Royal Mint/PA)

What makes a coin valuable?

What makes a coin valuable?

The 50 pence piece has become the most valued and collected coin in the UK, with many collectable designs appearing on its heptagonal canvas.

The 50 pence piece has become the most valued and collected coin in the UK, with many collectable designs appearing on its heptagonal canvas.

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Its 27.5mm diameter makes it the largest of any British coin, and allows space for decorative pictures. It has often been used to celebrate big events over the past 50 years of British history.

Its 27.5mm diameter makes it the largest of any British coin, and allows space for decorative pictures. It has often been used to celebrate big events over the past 50 years of British history.

The rarest coins tend to be of the greatest value, with the mintage (number of coins with each design made) being the fundamental attraction for collectors.

The rarest coins tend to be of the greatest value, with the mintage (number of coins with each design made) being the fundamental attraction for collectors.

Along with the design, other aspects of the coin which increase value are the condition of the coin and whether it has an error in its design.

Along with the design, other aspects of the coin which increase value are the condition of the coin and whether it has an error in its design.

The way in which it is sold can also determine the coin’s value - while some coin collectors will bid vast amounts of money on eBay or at auction, others opt for more robust valuations by selling via a coin dealer.

The way in which it is sold can also determine the coin’s value - while some coin collectors will bid vast amounts of money on eBay or at auction, others opt for more robust valuations by selling via a coin dealer.