No one keeps an exact count of coins in circulation because their usage is too wide and too diffuse. However, the U.S. Mint does provide figures for how many coins are minted each year, but those numbers don't account for how many older coins are lost, stolen, melted, exported, etc., which of course reduces the total in circulation.
Assuming it's from circulation, £1.
If it's from circulation, about 2¼ cents.
From what country? If it's from Canada, it's an ordinary circulation coin worth, well, $2.00
If it's a Canadian $1 coin that's the same size and similar in color to a US $1 coin (i.e. golden / brass color and a bit larger than a quarter) it's a common circulation coin worth only face value.
The coin is still in circulation today and has face value only.
The coin is still in circulation today and has face value only
The coin is still in circulation today and has face value only
The coin is still in circulation today and has face value only
The coin is still in circulation today and has face value only
Assuming it's from circulation, £1.
Their still in circulation, the coin is worth 10 cents.
It's face value, the coin is still in circulation.
It's face value, the coin is still in circulation.
The US $1 dollar coin dated 1979 has no silver in it, they are still in circulation if this coin is from pocket change spend it.
...Of what US coin? There have been several US coins intended for circulation ranging from half a cent to $20.
Your coin is from Switzerland and is still in circulation. At the exchange rate in effect early in 2010 it's worth a bit less than US$1.
It's an ordinary circulation coin - check your pocket change. Face value only.