The rarest Royal Mint coin in circulation today has sold for nearly 250 times its face value on eBay this week. The King Charles III Atlantic Salmon 50p sparked a mini bidding war amid coin collectors ...

If you're lucky enough to get one of these 20p coins in your change, don't just pass it on - it could be worth a fortune.

Of the various $1 coin designs, one stands out due to an almost imperceptible error made at the Royal Australian Mint in 2000 ...

A £2 coin from 2014 could make you a significant amount of money - but only if it has a certain error. Here's what you need ...