Take it to any dealer to get his offer. A true appraisal would only be necessary for a certified high-grade coin.
Any coin dealer will do this for you, but the 1922 Peace dollar (regardless of any mintmark) is the most common of all peace dollars, so don't expect a high value.
I suggest you take it to a coin shop and have it appraised.
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The Great Law of Peace Sacagawea golden dollar coin is worth its face value of $1. However, it may have some additional value to collectors depending on its condition, rarity, and demand. It's recommended to have it appraised by a reputable coin dealer to determine its exact value.
The is no 1921S Peace dollar; Peace dollars were not produced in San Francisco ("S" mintmark) in 1921. If your 1921 dollar coin is a Peace dollar, it was produced in Philadelphia and has no mintmark; if it has an "S" mintmark, it is a Morgan dollar produced in San Francisco).
They stopped making the Peace dollar in 1935.
The 1921 Peace dollar was minted to commemorate the end of World War I.
The image on the 1923 Peace Dollar is that of Lady Liberty.
The last Peace dollar was issued in 1935 so it can't be a 1942 Peace dollar. Look at the coin again and post new question.
Type in Peace dollar in your browser and click images.
On your browser type in " Peace Dollar " and click on images, this is the easy thing to do.
It looks the same as any other Peace dollar.