$5.00 this unit of currency is incredibly common.
$1.00 us money
elizabeth11 1982 twenty pence worth
in the states a nickel and a quarter. in the UK a twenty pence and a ten pence.
It's still worth 20 pence, which currently converts to 26 cents in US dollars.
As of today (01APR2011), 20 pence (British Pound Sterling) is worth about $0.32 in USD.
Elizabeth ll D.G.REG.F.D.1983
Queen Elizabeth was not born until 1926, and the Brits do not make "dimes".
As with most 20p coins since their introduction in 1982 the date is on the back (the opposite side to the Queen's head) and such coins can be valued at exactly 20p. From the release of the new 20 Pence coin in 2008, the date is on the obverse (front) and it is still worth 20 Pence.
2 pence
It's worth nearly two pence for the copper.
How much is a UK half pence worth
The coin you are referring to is from Switzerland ("Confoederatio Helvetica" is Latin for "Swiss Confederation"), you haven't identified the denomination or the condition of the coin. Switzerland produced coins for 1, 2, 5, 10 and 20 Rappen in 1938, but not the usual 1/2 Franc, Franc, 2 Franc and 5 Franc coins (although very valuable patterns of the 1 and 2 Franc coins were produced). Depending on denomination and condition of your coin, it could be worth between a few cents and perhaps $20.