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

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.

Alamy20p twenty pence obverse heads over 2012 coin[/caption] RWB AuctionsThe 20p coin that sold for a whopping £70[/caption]

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 more money if you do spot one.