Such a coin does not exist.
In the English Monarchy, a "bronze" Jubilee is not celebrated or commemorated.
A bronze Jubilee represents an anniversary of 8 years which is not a significant milestone.
1977 was the Silver Jubilee year (25 years of reign) of Queen Elizabeth II.
1972 was the Silver Wedding Anniversary (25 years of marriage) of Queen Elizabeth II and Prince Phillip.
Crown commemorative coins (25 Pence) were issued for both.
Commemorative circulation coins were not issued in Queen Victoria's day. Crown coins issued from late 1887 to 1892 have what is known as the "Jubilee" bust of Queen Victoria. It is very possible that you have a commemorative medallion or some other type of souvenir of the occasion.
There was no 1946 British Crown minted.
There was no 1908 British Crown (Five Shilling) minted.
There was no 1956 British Crown (Five Shillings) minted.
There was no 1923 British Crown (Five Shillings) minted.
There was no British Crown minted from 1938 to 1950 inclusive.
There was no British 1907 Crown (Five Shillings) minted.
There was no British Crown minted from 1903 to 1926 inclusive.
There was no British Crown minted from 1848 to 1886 inclusive.
There was no 1963 British Crown (Five Shillings) minted.
There was no British 1886 Crown (Five Shillings) coin minted.
There was no British 1846 Crown (Five Shillings) coin issued.