The slight error that can mean your 20p is worth £3,000

There are some coins which are known to fetch large sums of cash

Your 20p could be worth a lot more - because of an imperfection. Some seemingly insignificant coins in your pocket might actually be worth a pretty penny.

Rare 20p coins have been known to fetch large sums at auction. If you stumble upon a coveted coin in your change, you can turn a profit by selling them either online or in person at an auction, or through a dealer.

A coin with a minting error could be worth a lot as very few make it into circulation. The value of a coin fluctuates based on factors such as demand and rarity.

Read more: Seven supermarket changes coming

It's crucial to remember that there's no guarantee of making big bucks if you decide to sell your change. While anyone can list a coin on eBay and ask any price they want, a coin is only ever worth what someone is willing to pay for it.

Checking recently sold items will give you a more accurate idea of what people are willing to shell out for a specific coin. If you managed to sell all of the coins mentioned below for their top value, you could rake in up to £3,312.

The undated 20p is considered the "holy grail of change collecting", according to ChangeChecker. Since its release in 2008, collectors have been on a relentless hunt for this valuable coin. The Royal Mint had decided to shift the date from the back to the front of every 20p piece.

However, due to an unintentional mistake, a batch of between 50,000 and 250,000 coins was circulated without any date at all. Kimberley Day from RWB auctions stated: "These British coins were the first in more than three hundred years to enter circulation with no date. Real examples should have no date on either side but otherwise look similar to standard 20ps. These coins sell online for up to £100."

We found on eBay that one of these error coins sold for £75 on September 25.

Another fetched £69.99 on September 20, and a third went for £68 on September 15.