1 dollar
More information is needed. What country issued the coin? What's its date? What is the wording on the coin? Please post a new question with those details to help ID your coin.
Much more information is needed. What country issued the coin? What's its denomination? What is the wording on the coin? What's its date? Please post a new, separate question with those details to help ID your coin.
It depends on the year and country you are talking about. Many countries use currencies called Pesos or similar, and even within a single country, depending on the year you are talking about, the dimensions of the coin can change (such as with the US one dollar coin from the Eisenhower dollar of 1978 to the Susan B Anthony dollar of 1979).
The USA 3 Cents coin, issued 1851 to 1889. Two versions of the silver 1869 coin > The 14mm size coin has a star on the other side. The 18mm size coin has a portrait on the other side.
Please check your coin again and post a new, separate question with the name of the country that issued it. Several countries use pesos as their currency.
Italy.
The US issued no silver coins of any type in 1979, but if you mean a 1979 SBA dollar coin, just spend it.
What country? So for example in England the £1 coin was first issued in 1983.
There were no Australian commemorative coins issued in 1979. The only Australian decimal coin to have the Coat of Arms on it is the non-commemorative 50 cent coin.
1 dollar
In 1979, the dollar coin issued by the US was the Susan B. Anthony, which has no silver content and no real collector's value, so is a "spender".
An Australian 1979 1 cent coin, uncirculated and in absolute mint condition could fetch up to $2 AUD. An Australian 1979 1 cent coin (Proof), uncirculated and in absolute mint condition could fetch up to $4 AUD. There were 130.339 million minted. They are no longer in circulation, but unless they are part of a proof set or as previously described, they are worth 1 cent. A reputable coin dealer will be able to give a more accurate valuation.
That depends on what country it was issued in, what denomination it is and what condition it is in.
More information is needed. What country issued the coin? What's its date? What is the wording on the coin? Please post a new question with those details to help ID your coin.
It could be any 50 cent or 50 Pence coin issued since 1953 by any of the 50 plus Commonwealth countries. If the coin has no country name on it, it is most likely a British 50 Pence coin issued between 1969 and now.
There's no such thing as an "international coin".If you mean a coin from a country other than the US it's called a foreign coin in every country except the one that issued it.In any case you need to post a more specific question with the coin's denomination and the name of the country it came from.