The 1975 Isle of Man 'MANX CAT' CROWN (25p) would be worth around £2 - £3 (September 2010). They often come in plastic cases surrounded by a red cardboard for presentation.
The same coin was also struck in sterling silver (0.925) and would be worth around £12 - £15.
Value of an 2004 2 pence coin magnetic
The "face value" of a coin is whatever is inscribed on it, hence the term "face value". The face value of a 10 Pence coin is 10 Pence.
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.
There was no 1974 British 25 Pence coin minted.
Such a coin does not exist. The 10 pence coin was first issued in 1968.
There was no 1978 British 25 Pence coin minted.
Such a coin does not exist. The British 50 Pence coin was first issued in 1969.
Such a coin does not exist. The Irish 10 Pence coin was first issued in 1969.
The British 20 Pence coin was first released in 1982.
Such a coin does not exist. The Royal Australian Mint has never produced a Two Pence coin.
There were no British 1975 25 Pence coins issued.
Such a coin does not exist. The British 20 Pence coin was first issued in 1985. They are heptagonal, not round.