William and Mary Five Guinea coins were minted in every year from 1691 to 1694 inclusive.
A British 1691 to 1694 gold Five Guinea coin (KW III and QM), (depending on Regnal year) circulated but still in good condition, it might fetch anything from £2,000 to £17,500 GBP.
A reputable coin dealer will be able to give a more accurate valuation.
NOTE - The reverse of these coins is upside down to the obverse. This is normal.
British gold coins have been minted for over a thousand years. In 1786, the British gold coins in circulation were the Five Guinea, Two Guinea, Guinea and Half-Guinea coins. The Guinea was equal to 21 Shillings.
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 1907 Crown (Five Shillings) minted.
There were no 1823 British Crowns (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.
The Royal Mint produced no British Five Pound coins from 1938 to 1979 inclusive.
There was no 1970 British Crown (Five Shilling) coin minted. The last British predecimal Crown (Five Shilling) coin to be minted was in 1965.
There were no British Crown (Five Shilling) coins issued from 1903 to 1926.