In 1966 Guernsey issued a rather unique-looking pre-decimal 10 shilling coin to mark the 900th Anniversary of the Norman Conquest of England in 1066.
This is due to the fact that it is square with rounded corners and though it circulated as legal tender, we can offer you them in uncirculated condition.
The obverse shows the second portrait of Queen Elizabeth II and the obverse has an image of William the Conqueror. Although he was known as Duke of Normandy before his invasion of England, he also controlled Guernsey since he expelled a colony of pirates back in 1061.
Even today the British monarch holds the title of Duke of Normandy on the Channel Islands.
Cased as shown