20 pence
Yes. The current 5 pence coin issued since 1990, weighs 3.25 grams. The current 10 pence coin issued since 1992, weighs 6.5 grams.
653 pence
2 Pence coins are not used as commemoratives.
In the United kingdom it would be worth 10 pence. In the USA it would be the equivalent of about 16 cents
about 30 cents
The British Ten Pence coin was not issued until 1968.
Assuming it's a current British 2p coin dated 1968 or later, in average condition it's only worth face value - roughly US 3¢
A bank will only ever give you 20 Pence for a 20 Pence coin.
The 50 Pence coin is still in use. It is equal to half a pound (GBP).
Such a coin does not exist. The 50 New Pence coin was first issued in 1969.
All years of issue of the British 20 Pence coin are still in circulation and are worth 20 Pence in Britain and its dependencies. As at 14-May-2012, 20 Pence British is worth about $0.32 USD.