An error at the Royal Mint means that 1000's of "faulty" 20p coins have gone into circulation.
As you may know coins were redesigned last year and on the 20p the date was moved from the tails to the heads side. A number of new design 20 pence coins have been incorrectly struck using the heads side of the old design and tails side of the new version. This means that the coins have no date.
According to coin collectors 20p coins accidentally issued with no date on them could be worth £50 each.
British coins have had a date printed on them since 1662. This is the third error since decimalisation was introduced in 1971.
Between 50,000 and 200,000 of the coins are thought to be in circulation.
The coins are legal tender.