2008 Shield Twenty Pence Undated Mule Error Circulated Coin
The holy grail of change collecting: the rare undated 20p. An interesting error occurred at The Royal Mint in November 2008: a small number of Twenty Pence pieces were struck without the year. These British coins were the first in more than 300 years to enter circulation without a date. The Mint reports that of the 136 million Twenty Pence pieces minted that month, only about 250,000 coins were minted with this unique error. The issue occurred because a mismatched pair of dies was used in the minting process. Coin experts call errors like this 'mules,' and modern examples are very collectable because they are rare given today's rigorous quality control procedures. These coins have previously been in circulation and have been individually authenticated by our specialists. System.Threading.Tasks.Task`1[System.String] System.Threading.Tasks.Task`1[System.String]