The Royal Mint has never produced a Quarter-Sovereign coin until 2009. There has never been a need for a Quarter-Sovereign coin, since the Crown (Five Shillings) did the job and, after decimalisation, the 25 Pence coin to a lesser extent.
The recent interest shown in Quarter-Sovereign coins seems to stem from a disreputable somebody claiming to have scooped the world market on a finite number of coins only available to them and, mysteriously originating in Another Country.
Such a coin does not exist.
The first and only Quarter Sovereign produced by the Royal Mint was minted in 2009.
One Pound GBP in 1980 had the purchasing power of about £2.87 GBP today.
There were never any British Two and a Half-Sovereign coins minted.
There was no British 1974 Half-Sovereign minted. The first decimal British Half-Sovereign was minted in 1980.
British Coachways was created in 1980.
British Knights was created in 1980.
The current value of a 1980 P-D-S Mint set is $8.00.
British Telecom came into existence in 1980
British School of Amsterdam was created in 1980.
The value of the copper in a 2 Pence coin would be significantly less then 10% of the face value of the coin at the time the coin was minted. Today, it might be a little more, about 0.2 Pence.
Too Close for Comfort - 1980 The British Are Coming the British Are Coming 5-14 was released on: USA: 5 October 1985
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The coin has face value only.