From
http://news.bbc.co.uk/1/hi/wales/south_east/8123749.stm
Quote:
Faulty 20p coins 'worth £50 each'
A batch of 20p coins accidentally issued with no date on them could be worth £50 each, say coin collectors.
They are said to be the first undated British coins to enter circulation for more than 300 years.
The date on the new 20p was moved from the 'tails' to the 'heads' side when the country's coins were redesigned last year.
The coins without a date were created by accidentally pairing up the new 'tails' side with the old 'heads' - meaning no date appeared at all.
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I've seen reports that they're selling on eBay for over £400 each.
How to identify an error coin:
http://www.undated20p.com/identification.html