A coin commemorating Queen Elizabeth II Silver Jubilee could be worth £150.
In 1977, nearly 37 million Silver Jubilee Crowns were minted to celebrate the Silver Jubilee of Her Majesty. The Silver Jubilee of Elizabeth II marked the 25th anniversary of Queen Elizabeth II's accession to the thrones of the United Kingdom and other Commonwealth realms.
The coin, at face value, was 25p. However, many people kept the coin for commemorative purposes. The coin, despite it being a 'Silver Jubilee' coin is not actually made out of silver but rather refers to the anniversary.