This is a rare and unique 20p coin from the Royal Mint with an error that occurred in 2008. The coin has no date and is a mule coin, making it a fascinating addition to any coin collection. The denomination of the coin is 20p, and it was manufactured in the United Kingdom, specifically in Great Britain.

This coin is a must-have for any serious collector of British decimal coins. It is a great example of the error that occurred in 2008 and is a rare find. The coin has not been dated, which adds to its uniqueness and makes it a standout piece in any collection.