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.
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.
British Telecom came into existence in 1980
British School of Amsterdam was created in 1980.
The current value of a 1980 P-D-S Mint set is $8.00.
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.