Rare 20p coin worth more than 250 times its face value - what to look for
The coins have been dubbed the 'holy grail' of change collecting and if you find one it could be worth a lot more than 20p ...
Rare 20p coin selling for over 250 times its face value - check your change
An unusual coin could net its owner over 250 times its face value after an error when it was made. The rare 20p coin was one of an unknown number released by the Royal Mint without a date.
20p: Coins set to sell for 500 times face value in Newcastle
A minting error on a small number of 2008 twenty pence coins has made them highly desirable, with some expected to sell for as much as £100 ...