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 proofs have a satiny finish as opposed to the highly-polished surface normally associated with proof coins. There are some very good pictures at http://www.numismedia.com/fmv/prices/libnkl/pricesgd.shtml
The Proof 1998s Silver Matte Finish $300.00 per Red Book.
In pre-decimal days, the word "specimen" was often used to describe "Proof" coins, so in modern terms a "Specimen Matte Proof set" is a "Matte Proof set". 1937 was the Coronation year for George VI, and there were a few different Proof sets issued by the Royal Mint, both of which were referred to as "specimen" sets. The word "specimen" is most likely included on the original packaging, if there is any packaging. The four coin Proof set includes the Five Pound to Half-Sovereign coins. A Matte Proof set was offered for auction in March 2011, after authentication by the Royal Mint, and was expected to get over £90,000 GBP. There is no indication what the sale price was, or even if it sold. Depending on whom you choose to believe, this coin set is either "unique" or "rare". The fifteen coin Proof set includes the Crown to the Farthing and the Maundy set. There is almost no convincing information available on the "Matte Proof" set and only very fleeting references to the fact that one may have been produced at all. In the absence of any useful information, a reputable coin dealer will be able to identify your set and maybe authenticate it, and give a reasonable estimate of value.
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.
A 1922 matte proof Peace Silver Dollar is very rare - if you are fortunate to possess one, its value is at least $60,000! The term "matte" refers to the coin's appearance. Instead of having a very shiny surface, matte proofs look as if they were very finely sandblasted. There's an excellent set of pictures at the following link: www.coinfacts.com/silver_dollars/peace_dollars/1922_peace_dollar.htm
Coins were made with a matte finish specifically for collectors. Proof coins were made with an extra mirrored finish for the same reason. Either way, the finish increases or decreases the value of the coin.
Only Proof 1922 Peace dollars were struck in matte & satin finish and are very rare. But if you think you have one, take it to a coin dealer.
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.
For the Peace dollar series 1935 is not a rare coin. The only rare Peace dollar is the 1922 high relief matte proof coins.
A reverse proof coin features a contrasting finish that highlights the design elements, with the background appearing shiny and the raised areas matte. This technique creates a striking visual effect, enhancing the details of the coin's imagery. Reverse proof coins are often produced in limited quantities, making them popular among collectors. They are typically issued as commemorative pieces or special editions by mints.
Matte or matt proof coins normally are associated with very well struck up coins with a dark or dull patina. They are normally struck in the Coronation Year of any king or queen. For example the 1902 Edward VII British Halfcrown was struck as a matt proof as well as the normal 'currency' coin. The matt proof example is worth £200 in mint condition (most are). Correct as at 22 March 2012