IF you're feeling the pinch after all that Christmas shopping, it might be worth having a rifle through your wallet.

This isn't about finding a James Bond fiver or checking for one of the AK47 notes either, this time the big money is going on a £2 with a very specific printing error.

4 This is the £2 in question, which was released in 2007

The good news is it's found on the coin which was released in 2007 to mark the 200th anniversary of the 1807 Abolition Of The Slave Trade. Why's that good? Because it's graded as 'scarcity 1', which means it's not that collectable because it's readily available.

In fact, there were 8,445,000 of these minted... but, of course, it's the printing error which means they're worth the big bucks.

The problem comes with the wording on the edge of the coin, which reads: "Am I Not A Man And Brother."

4 Versions are on offer for hundreds of pounds on eBay

As normal, when the queen's head is facing upwards the writing should run along the side so you can read it.

But it seems some of the coins were printed with the writing upside down.

It might not sound like a big deal, but these rare coins are exchanging hands for big bucks online.

4 The ones being sold all have upside down lettering around the side, as seen here. The wording should not be facing towards the queen's head

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One buyer has three versions of the coin on offer, all with slightly different mistakes. The asking price is £360.

It's worth noting that one of them has the initials 'DG' inscribed, standing for David Gentleman who designed it. That makes it rare as it means it is from a presentation pack - another way to tell is that these are smooth, whereas the ones in circulation were textured.

They aren't alone, with another on offer for £300.

4 Here a normal and rare coin are compared

How much the coins will actually go for is anyone's guess, and there are cheaper versions up for sale on eBay. One has been listed for £199 and there's another for sale for £39.99.

The reason for the upside down writing is simple.

Coins were given words along the edges to make them harder to forge, but the lettering is added before the coin is struck.

That means it was a mistake, which makes the item instantly collectable.

Don't have one in your piggy bank? All isn't lost because you could still have a rare coin knocking around, check this guide to find out.