The larger pre-1993 10 Pence coins were withdrawn from circulation and demonetised in 1993. So, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they have little or no value.
The PM is possibly AM, the initials of the designer, Arnold Machin.
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.
Such a coin does not exist. Canada has not used the British sterling currency system since the mid-19th century.
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.
Such a coin does not exist. The 10 pence coin was first issued in 1968.
There was no 1974 British 25 Pence coin minted.
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.