Uncirculated coins go through the normal minting process, but are then removed and placed into sets for collectors. Proof coins are made on specialized dies to achieve better detail and more shine in the finish.
The term Proof actually refers to a method of manufacturing that produces coins with very sharp details and a mirrorlike surfaces and are called Proof coins. Uncirculated or Mint State coins are coins not released into circulation and have no wear on them.
Uncirculated coins are ordinary coins that were struck for use in commerce but haven't been spent yet and have no wear. Sometimes you can be lucky and get a roll of uncirculated coins from a bank. Most Mints around the world also sell uncirculated coins to collectors; they're in sealed packages with some form of indication that the coins were never spent. Proof coins are specially struck for collectors. They're made separately from ordinary coins using highly-polished blanks and dies that produce extra-sharp, very detailed images. Many proof coins have mirrorlike surfaces but others receive special treatments that give a "frosted" appearance to the raised parts of the design or the background.
A mint set contains uncirculated coins from a specific mint in a specific year. Proof coins are specially made for collectors, minted with a higher quality finish, even mirror-like on some surfaces. Currently in the U.S., mint sets are available from Philadelphia and Denver, while proof coins are minted in San Francisco.
A 1961 proof set contains proof coins, which are specially made with extra care and polished dies to showcase the design details. These sets are typically sold to collectors. On the other hand, a 1961 special mint set contains uncirculated coins that were made with a higher standard than regular circulating coins but not as meticulously as proof coins. Special mint sets were produced by the United States Mint as an alternative to proof sets and were intended for general circulation.
If your 1972 coin is a uncirculated example it may be worth about $5.00 because the 1971 & 1972 issue coins were not included in the Uncirculated Mint sets sold from the Mint in those years. In general none of the coins made for circulation have any silver and are not worth more than face value. Only proof and uncirculated collectors coins sold from the Mint have premiums. The Mint did offer Proof and Uncirculated coins in 1971-1976 that were struck in 40% silver.
The American Eagle Gold coins are made in Uncirculated and Proof versions. Circulated means exactly that, it has been circulated and or used. We do not use any gold coins at all in every day business. Proof coins have a highly reflective, mirror-like surface. The surface of a uncirculated coin does not.
The term Proof actually refers to a method of manufacturing that produces coins with very sharp details and a mirrorlike surfaces and are called Proof coins. Uncirculated or Mint State coins are coins not released into circulation and have no wear on them.
Uncirculated coins are ordinary coins that were struck for use in commerce but haven't been spent yet and have no wear. Sometimes you can be lucky and get a roll of uncirculated coins from a bank. Most Mints around the world also sell uncirculated coins to collectors; they're in sealed packages with some form of indication that the coins were never spent. Proof coins are specially struck for collectors. They're made separately from ordinary coins using highly-polished blanks and dies that produce extra-sharp, very detailed images. Many proof coins have mirrorlike surfaces but others receive special treatments that give a "frosted" appearance to the raised parts of the design or the background.
These coins are still potentially in circulation so, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they are worth Two Pence.
A mint set contains uncirculated coins from a specific mint in a specific year. Proof coins are specially made for collectors, minted with a higher quality finish, even mirror-like on some surfaces. Currently in the U.S., mint sets are available from Philadelphia and Denver, while proof coins are minted in San Francisco.
1975 Proof sets are valued at $11.00.
NO, they do not. That's the simple answer.
All Australian 1992 coins are potentially still in circulation so, unless they are a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth whatever is inscribed on them.
Satin proof coins had a dull luster to them and looked too much like uncirculated business strike coins so they changed to the brilliant proof coins.
Isle of Man coins follow the dimensions, metallic composition and history of the equivalent British coins. The Half New Penny and Half Penny coins, the larger pre-1994 5 and 10 Pence coins and the larger pre-1997 50 Pence coins have been withdrawn. Unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they have little or no value. All other coins are still potentially in circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth whatever is inscribed on them.
The U.S. Mint does not assign grades to any coins it sells. But Proof and Uncirculated coins do have different grades.
Assuming the coin's denomination is given in euro cents and not pence, you have a common circulation coin from Ireland. In that case it's not worth any premium. Ireland is part of the eurozone so a euro coin would not have entered circulation any earlier than 2002. If it's not a euro coin, please post a new and separate question with its date.