Half sovereign - British coin - was created in 1544.
There were never any British Two and a Half-Sovereign coins minted.
It will be either a British Sovereign or Half-Sovereign.
Such a coin does not exist. The 1898 British Half-Sovereign was only ever minted at the Royal Mint London.
The British 22 carat gold Half-Sovereign coin is ~1.02mm thick.
A British Half-Sovereign has a face value of 50 Pence. They are made from 22 carat gold and, since 1980 have been issued as a collector or investment coin issued as either or Proof or bullion coin, or both, their actual value, depending on the year, is more likely to be anything from £140 to £200 GBP. See the link below for a currency conversion.
The was never a British 10 Shilling coin minted. A Half-Sovereign was the equivalent of 10 Shillings.
Unless it is a coin produced by a bank or some other organisation, there was no Half-Sovereign minted in 1981.
Such a coin does not exist. The only British Half-Sovereign coins minted in 1923 were minted at the Pretoria Mint in South Africa and were all Proof coins.
Since the Great Recoinage Act of 1816, all British Sovereign coinage has been minted to a rigid standard. All Sovereign coinage is made from 22 carat gold which 91.6% pure gold. The Half-Sovereign coin in mint condition, irrespective of when or where it was minted, is 19.3mm in diameter, 0.99mm thick and weighs 3.99 grams.
The only British 22 carat gold coins issued in 1899 were the Sovereign and the Half-Sovereign. The Florin was a silver coin from its introduction into the currency in 1848.
The Royal Mint did not produce a 1919 Half-Sovereign coin.
A British 1994 Half-Sovereign (Proof FDC), uncirculated and in absolute mint condition could fetch up to £150 GBP. A reputable coin dealer will be able to give a more accurate valuation.