The letters D G REG FD (and variations of it) appearing on any British coin or any coin of any of the 50 plus Commonwealth countries, is a Latin abbreviation for DEI GRATIA REGINA FIDEI DEFENSOR. The English translation is - "By the Grace of God, Queen and Defender of the Faith".
Variations of these titles have been used by British Monarchs in one form or another for hundreds of years.
Had there been a king on the throne, the word "REGINA" would have been replaced by "REX".
It is worth 20p.
Britain introduced a 20p coin on 9 June 1982.
It's a Heptagon
1982
A British 20p coin with no date present (2008 mule error) may be worth around £30 - £90. Sell it anyway you'll make a load of dosh!
It's a rare coin You collect them
eBay
One 20p coin and one 5p coin.
In British coinage the denominations lower than the 20p coin are the 10p, 5p, 2p, and 1p coins. There was also a half penny coin but this was withdrawn from circulation in 1984.
I think you mean Heskey? If you do, it's around 20p
The 2008 mule 20p is more valuable than other 20p coins because it is uncommon and desirable to collectors. If the United Kingdom switched to the Euro this would not change the value of the coin as a collectors item, in fact it would probably make the coin slightly more desirable.
Each 20p coin weighs 5 grams... Therefore - there would be 3632 coins (valued at 726.40)