The Royal Mint has accidentally issued undated 20p coins, and the collectors items are said to be the first undated British coins to enter circulation for more than 300 years.
It is estimated that between 50,000 and 200,000 undated coins were released into circulation, and collectors suggest they could be worth at least £50 today, and much more in future.
Back in 2008, the date on 20p coins was moved from the tails to the heads side, and the erroneous batch was created by combining the old heads with the new tails (as pictured right).
At present, private company The London Mint Office is offering to pay £50 for an undated 20p coin at its newly-created undated20p.com website. On eBay, meanwhile, undated 20p listings are attracting bids of hundreds of pounds.
