Nowhere. It's a common circulation coin in England worth face value only. A dealer here might give you a few cents for it and throw it in his "grab box" of foreign coins.
It's a rare coin You collect them
7
Jewelry and coin exchange coin shop
I have geroge v. king emporer coin of 1919 indian 1 RS. i want to sell can you tell me what is price.
about 20p
It is worth 20p.
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!
Britain introduced a 20p coin on 9 June 1982.
It's a Heptagon
1982
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 There was also a half penny coin but this was withdrawn from circulation in 1984.
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)
In British coinage 20p coins are quite common and will normally only be worth their face value. The only notable exception is the 'dateless' 2008 mule errors which are worth significantly more than their face value. (around £30-£90)