Not much, the old 10 pence coins usually sell for about a quarter or so in the US, the 10p coin was reduced in size and so the old large ones (the size of a Florin) are demonetized, but they still sell for about the equivalent exchange rate in the US.
However, I believe you got your date wrong as there are no British (or Irish) 10p coins dated 1966. The equivalent coin minted in 1966 would be the Florin, worth 2 shillings.
1964 was the last year for silver Roosevelt dimes. The "star" was added after the coin was struck at the Mint and is not a rare collectible coin, but it's still 10 cents.
How much is the coin worth
.99 to $3.00
$ 20.00
You'd really need to show them to a coin collector or shop. So much depends on their condition.
Such a coin does not exist. The 50 New Pence coin was first issued in 1969.
20 pence
In the United kingdom it would be worth 10 pence. In the USA it would be the equivalent of about 16 cents
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.
Assuming it's a current British 2p coin dated 1968 or later, in average condition it's only worth face value - roughly US 3¢
2 Pence coins are not used as commemoratives.
The British Ten Pence coin was not issued until 1968.
its worth $5.00
The groat was a silver coin worth four pence, but it hasn't been produced for circulation since the 1850s.
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).
its worth $5.00