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Tiny mistake to spot on 20p coin that makes it 350 TIMES more valuable – is one hiding right under your nose?

Published on April 03, 2025 at 12:00 AM

A TINY mistake on your usual 20p coin could make it a whopping 350 times more valuable.

You will need to look out for one small detail if you want to mint some extra cash.

Obverse of a 20 pence coin featuring Queen Elizabeth II.
20p twenty pence obverse heads over 2012 coin
Both sides of a twenty pence coin.
The 20p coin that sold for a whopping £70

Coins become more valuable if they have a low mintage, meaning not many of them have been created.

That means they'll be harder to find – but they can earn you moremoneyif you do spot one.

And not all coins need to be shiny and new to sell for a profit.

They can also be worth more if they have an, such as if they're missing a small detail.

Something similar happened to one lucky person who sold their regular-looking 20p coin for a whopping £70 at the RWB Auction's February 2025sale.

What makes the coin so unique and worth appraisal is that no one knows how old the coin is.

That is because the coin had no date on it – making it incredibly rare.

Such mistakes can happen from time to time and go unnoticed, meaning there is a chance you may have a super rare coin hiding in the change – all you need to do is look for mistakes.

Meanwhile, one of the most.

This is because of their large surface area, as there is enough space to add new and intricate designs.

A 2019 Kew Gardens 50p went under the hammer on eBay for a whopping £122.09 – 244 times its face value.

The coin, which attracted 13 bids, is one of the most sought-after pieces among coin collectors.

The Royal Mint, the official maker of British coins, regularly puts limited edition pieces into general circulation.

In some cases,have sold for a whopping £950.

Errors make a coin unique, which means they will most likely be worth more, as there a fewer of them.

Even without a misprint, if a coin has a low mintage, there are fewer of them in circulation and so are deemed rare.

As a general rule of thumb, the rarer the coin, the more valuable they are to collectors.

How to sell a rare coin

If you have managed to get your hands on a rare coin, there are a few ways you can go about selling it.

Online platforms like eBay, marketplace, or trading apps can be easy to use – but there are risks.

Scammers may try and target sellers with this trick – they'll say they are keen to purchase the item and ask for .

They have no plan on collecting the item and are only using the courier to grab free cash.

When buying or selling on it's advisable to meet up in person – make sure this is a safe space and avoid payment links.

Many sellers will choose to handle cash when meeting to limit the risk of scams.

To ensure the ultimate safety you can sell rare coins at anauction.

This can be done through The Royal Mint's Collectors Service which has a team of experts who can help you authenticate and value your coin.

Finally, you can sell rare coins on eBay.

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