Matte proofs have a satiny finish as opposed to the highly-polished surface normally associated with proof coins. There are some very good pictures at
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Matte proof coins are special proofs that have a grainy "sandblasted" look on the surface. Matte proof coins were sometimes made in the early part of the 1900's. Normal proof coins have a mirror like brilliant surface.
Proof-like coins have features similar to a proof coin, but may not fit the definition of a proof (for example, they may not be double struck). Proof-like coins have mirrored fields (you should be able to see your reflection in the spots of the coin where there is no design) and are generally of higher quality than coins produced for circulation.
Polished planchets are intended for Proof coins
It would depend on if the coin was released as a proof coin (very shiny and looks mirror like, with an "S" mint mark) or an "uncirculated" coin and the general condition of the coin. A Proof coin, depending on blemishes (or lack there of) and if it is a Type I or Type II, can get between $7 and $65. An uncirculated coin that has never been in someone's pocket, touched or scratched can get between $2 and $750. In any case, if the coin has been touched or damaged, spend it for the face value.
Correction to prior"Proof" in modern terminology indicates a specially-struck coin made using high-quality production methods. These include mirror-polished or "matte"-surface dies, high-pressure presses, and blanks selected for superior quality with no inherent nicks or other defects. Proof coins are not intended for circulation but instead exhibit the highest quality of the minter's art. They're sold to collectors and investors. Many countries issue proof-quality coins in varieties much greater than those minted for ordinary circulation. For example, the US strikes proof-versions of its 6 circulating denominations but in addition makes many bullion, commemorative, and other collector-only coins in proof quality as well.A Proof is a coin produced by a mint to show what coins were in circulation at that point in time. For example, a given year will produce a proof set. The proof set is to show the highest quality of the coins at the time. The original proof sets are worth many times their stated face value. In modern times proof sets are mostly a numismatic (coin collector) interest. You can see examples of proofs by looking up the US mint on the web or by paying a visit to ebay. Note that proof also is a slang for the quality of a coin. Proof coins are (Im not an expert but) in my mind a MS 65 (coin grade 1 - 70)
A "Matt Proof" coin is a process where the surface of the coin is deliberately finely granulated as distinct from the usual mirror like surface of "Proof" coins with frosted highlights. The flat surfaces will have a satin like appearance. FDC is an abbreviation for Fleur du Coin. It refers to a "Proof" coin that has been hand finished. Any such coins are usually protectively packaged by the Mint and are sold at a price well above the face value of the coin.
Matte proof coins are special proofs that have a grainy "sandblasted" look on the surface. Matte proof coins were sometimes made in the early part of the 1900's. Normal proof coins have a mirror like brilliant surface.
That does not sound like anything done specially at the mint because matte finishes are normally applied to certain areas of the design and then only to proof coins. Coin blanks can have all sorts of imperfections which may resemble a matte finish.
Both processes are used on Proof coins to enhance the appearance. "Frosting" is the slight sand blasting of (usually) the raised surfaces of the coin to give a slightly dulled appearance in contrast to the mirror like finish of the flat surfaces of the coin. "Matt" or "Matte" was a similar process but more so on the flat surfaces of the coin. "Frosting" is the favoured process on modern Proof coins.
It is really hard to describe what a proof coin looks like in text. But the coin will have mirror-like fields (the part of the coin with no design) and will be exceptionally well struck. All bands on the reverse of the coin should be distinguishable and separate. A 1941 proof dime is worth quite a bit and should never be handled with your hands as the oils will damage the delicate surfaces. Instead, if you think you have a proof coin, take it to a coin dealer and he will tell you if it is indeed a proof dime or merely a business strike coin.
Well, an uncirculated one would sell for whatever 1 ounce of silver is selling for, today about $27. However you say with proof, I'm not sure what that means, if you mean it has some sort of certificate of authenticity or it is a proof coin. A proof coin will have mirror like fields (parts of the coin with no design) and an uncirculated coin will have shiny, but not mirror like fields. A proof coin is more expensive and would sell for around $70.
Proof-like coins have features similar to a proof coin, but may not fit the definition of a proof (for example, they may not be double struck). Proof-like coins have mirrored fields (you should be able to see your reflection in the spots of the coin where there is no design) and are generally of higher quality than coins produced for circulation.
KG VI means King George VI. A "Matt Proof" coin is a process where the surface of the coin is deliberately finely granulated as distinct from the usual mirror like surface of "Proof" coins with frosted highlights. The flat surfaces will have a satin like appearance. FDC is an abbreviation for Fleur du Coin. It refers to a "Proof" coin that has been hand finished.
By looking for wear. In practice, it doesn't matter what grade your silver eagle is, it will simply sell for bullion. The only thing to look is if your coin is proof or bullion. A proof coin will have mirror-like fields where you can see yourself like a mirror. An uncirculated coin may look shiny but it won't be nearly as shiny as a proof.
Polished planchets are intended for Proof coins
Coins can be shiny without them being Proof. A Proof coin is struck on specially prepared and polished dies. The finished coin will have a mirror like finish on the flat surfaces. Proof coins are sold in protective packaging to protect the finish. If the coin has maintained its finish, there will still be the high quality finish with no dents, scratches of other damage to mar the coin. A proof coin that has been handled or circulated has lost its Proof finish and any collector appeal and value it may have had.
A proof coin is a coin that is made to test the mint and ensure that the coin is of proper quality before mass production. Generally, a proof is not circulated, but they are sometimes sold to collectors.