this is a poorly phrased question. however I assume that you are asking the length and the width of one. the length is 28.4 mm and the width is 2.5 or 3.1mm, different websites say different things.
Currently, British general circulation currency comes in the following denominations - 1 Penny coin 2 Pence coin 5 Pence coin 10 Pence coin 20 Pence coin 50 Pence coin 1 Pound coin 2 Pound coin 5 Pound note 10 Pound note 20 Pound note 50 Pound note
A 1889 gold 5 pound coin is worth 5 pounds of gold, while a 1889 2 pound gold coin is only worth 2 pounds of gold.
Please check your coin. You possibly refer to the 1986 commemorative Two Pound coin.
There is a one pound coin and a two pound coin but not a three pound coin.
Face value.
£25
Yes
£2
Any coin with two dates on it, 200 years apart, is a commemorative. The British 2 Pence coin has never been used as a commemorative, but the 2 Pound coin has. The British 2004 Two Pound coin commemorates the 200th Anniversay of invention of Trevithick's locomotive.
The British One Pound coin is round.
£2.00
The 1983 One Pound coin was the year of first issue for the British One Pound coin which replaced the One Pound note. The British One Pound coin is legal tender anywhere in the United Kingdom and some of its dependencies.