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It's called a matte finish.
None, no Matte or Satin Finish proofs were struck at the Denver Mint. Only at the Philadelphia Mint.
There's a set of pictures at the site under Related Links.
The Proof 1998s Silver Matte Finish $300.00 per Red Book.
The last Morgan dollars were minted in November 1921. All 1922 silver dollars carry the famous Peace design. Please see the Related Question for details.
The 1998-S silver matte finish Kennedy half dollar with the letter p is worth $500
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.
Matte proofs have a duller, almost sandblasted appearance. There are contrasting images at the site linked below:
Sandblasting is one way of producing a matte finish.
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
For the Peace dollar series 1935 is not a rare coin. The only rare Peace dollar is the 1922 high relief matte proof coins.
It is a brushed finished, which is not completely matte, but still has a good bit of shine.