Beth found this in the change of the BBQ takings at the Cowfold fair.
It's one of the 2009 mismatched coins that has no date and we are auctioning it for charity.
The ebay auction can be found here
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=130316755681
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Undated 20p coin Charity