The new £1 coin went into circulation on 28 March 2017, bringing an end to the beloved round pound. The 12-sided £1 coin is the ‘safest coin in the world’ , meaning it’s much harder to counterfeit.

But since the coin’s release, some new pounds have appeared on eBay for much more than £1. In fact, some new £1 coins have been selling for as much as £250 online.

But how can you know if the £1 coin in your pocket is worth this much? Let’s take a look at the rare new £1 coins that are worth the most.

The test coin

The £1 coins that are selling for the most money on eBay are the 2015 trial pieces. The Royal Mint made these to give to vending machine companies. This was so when the new 12-sided £1 coin came out this year, we’d all be able to use them in machines. The public was never supposed to see them so they shouldn’t have ended up in circulation.

But it seems that a few 2015 trial £1 coins slipped through the net and have made their way online. They’re now selling for over £100 online, with some going for £250. So if you see one of these trial pieces, it’s likely to be worth considerably more than £1.

If you’re looking for a valuable coin, just be careful on eBay. One thing to look out for is for people listing the 2016 new £1 coin as a trial piece. This is because the 12-sided £1 coin only came out this year, so some people are wrongly assuming that coins with 2016 date are trials too. But this isn’t the case – they’re just regular new £1 coins the Royal Mint made early. So they’re still only worth a quid!

Faulty new £1 coins

Another reason why some new £1s are selling on eBay is if they’re faulty. £1 coins where the Queen’s head is printed upside-down or the design is off-centre are proving particularly collectable. This is because the Royal Mint has very high standards. So if some faulty coins make it into circulation, it could very well be worth more than £1.

Just remember that as the 12-sided £1 coin is new, it’s not yet clear which faulty coins are worth anything. Just because there’s a small printing flaw in your new £1 coin, this doesn’t guarantee it will sell online. Most coins aren’t perfect so it’s unlikely to be unique.

If you think you’ve got a faulty £1 coin that could be worth a small fortune, have a look online. You’ll be able to see the coins that are selling for the most – and this should help you work out whether yours is of any interest.