TB is the initials of Thomas Brock (1847-1922), the designer of the "old veiled" bust of Queen Victoria which appeared on British coins from 1893 to 1901.
It will be either a British Sovereign or Half-Sovereign.
The letters DS do not appear on a Half-Sovereign.
There was no British 1974 Half-Sovereign minted. The first decimal British Half-Sovereign was minted in 1980.
Half sovereign - British coin - was created in 1544.
There were no 1981 British Half-Sovereign minted.
There were no British Half-Sovereign coins minted from 1938 to 1979 inclusive
There were no British Half-Sovereign coins minted from 1938 to 1979 inclusive
There were no British Half-Sovereign coins minted from 1938 to 1979 inclusive
There were no British Half-Sovereign coins minted from 1938 to 1979 inclusive.
There were never any British Two and a Half-Sovereign coins minted.
The Royal Mint did not produce any British Half-Sovereign coins from 1938 to 1979 inclusive.
The British 22 carat gold Half-Sovereign coin is ~1.02mm thick.