A hoard of more than Anglo Saxon 5,000 coins have been unearthed, including what may be a unique penny.
The discovery, near Lenborough, Buckinghamshire is said to be the biggest hoard of coins in modern times.
It includes a uniquely-stamped coin which may be the results of a mix-up at the mint, more than 1,000 years ago.
No valuation has officially been placed on the coins, which have formerly been declared as treasure trove, but some experts believe they could be worth more than £1 million.
The 5,248 coins were found by metal detector enthusiast Paul Coleman on December 21 last year.
He almost decided not to dig the site when his metal detector beeped, believing he had come across a hidden manhole cover.