A British 1953 cupro-nickel Crown (Five Shillings)(Queen Elizabeth II Coronation - edge inscription = FAITH AND TRUTH I WILL BEAR UNTO YOU), uncirculated and in absolute mint condition could fetch up to £8 GBP. If it has been circulated but still in good condition, it might fetch up to £4 GBP.
Check your local "Yellow Pages" telephone directory for Coin Dealers in your area.
Go for one that has been established for many years and operates out of a shop rather than only a post office box or email address.
There was no 1955 British Crown (Five Shillings) minted. You possibly refer to the 1953 "Coronation" Crown.
There was no 1946 British Crown minted.
There was no British 1907 Crown (Five Shillings) minted.
There was no British Crown minted from 1938 to 1950 inclusive.
There was no 1923 British 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 1908 British Crown (Five Shilling) minted.
There was no 1956 British Crown (Five Shillings) minted.
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.