There are many pennies that average from a few hundred to a few thousand.
There is a unique error wheat penny, a 1943 coin minted at Denver, that recently (2011) sold for $1.75 million. This coin was struck on a bronze blank left over from 1942, while all 1943 cents were supposed to be made of steel to save copper for use in ammunition.
The other 2 mints (Philadelphia and San Francisco) also had similar errors but made a total of somewhere between 10 and 20 such coins, so they're not worth as much as the Denver error.
about 1/2 a million dollars
1 Dollar.
1 dollar
1 dollar
1 dollar
Presumably, you refer to the 1 Dollar coin(?). An Australian 1984 1 Dollar coin, uncirculated and in absolute mint condition could fetch up to $15 AUD. They are still in circulation, so unless they are part of a proof set or as previously described, they are worth 1 Dollar. There were over 186 million minted. A reputable coin dealer will be able to advise a more accurate quotation.
Ireland does not use the dollar and never has, so there is no such thing as an Irish 1 dollar coin. Ireland was using the pound in 1952, but there was no 1 pound coin. So whatever coin you have, cannot be either an Irish one dollar coin nor an Irish one pound coin from 1952.
The coin is just a dollar spend it.
1 dollar
silver dollar
If this question is about the coin's value, it's worth one dollar.
It is worth over three million dollars due to the rarity of the coin. Be careful not to confuse this with a standard Jefferson Presidential dollar coin, which is only worth $1.