British currency currently in circulation -
310$
Good luck if you have one, but the last British Sixpence was minted in 1967.
As of 31 July 2014, 1.00 British Pounds is worth about 1.69 US Dollars.
The bicentennial dollar coin is still worth one dollar.
It is worth one dollar.
A 20 Pence coin is a British coin worth one fifth of a British Pound (GBP). A "nickel" is a US 5 cent coin. At current exchange rates (Jan 2011), the British 20 Pence coin is worth about 32 cents USD.
What you presumably have is a James Buchanan presidential dollar coin. It was minted in 2010 and is worth one dollar.
The bicentennial dollar coin is still worth one dollar.
One pound. At current (October 2016) exchange rates that's about a buck and a quarter American.
The one cent Euro coin is worth 0.6452 of an American cent.
Centenary of what? What country, what coin, what year?
The last British Shilling minted for general circulation was minted in 1966.