Vero86 - Your coin is a 1922-S (San Francisco Mint) silver dollar. It is commonly called a “Peace dollar” because of the word “PEACE” at the bottom reverse (below the eagle).
The coin is 90% silver and 10% copper and weighs 26.73 grams. The diameter is 38.1 millimeters and it is 2.4 millimeters thick. (These standards go back to 1837.) The coin contains 0.77344 troy ounces (24.0567 grams) of pure silver. (Troy weight was used at the US Mint until the mid-20th century.)
Your coin has seen circulation wear and has a very distracting punch mark at center of the obverse (Liberty’s portrait). Because of these it has no meaningful coin collector value, but its worth is equal to the market value of silver it contains. The coin might also have personal or family interest well beyond its nominal commercial worth.
[Side Note: “Troy weight is a traditional system of weight in the British Isles based on the grain, pennyweight (24 grains), ounce (20 pennyweights), and pound (12 ounces). The troy grain, pennyweight, and ounce have been used since the Middle Ages to weigh gold, silver, and other precious metals and stones. The name supposedly derives from the city of Troyes in France, site of one of the major medieval fairs. The troy pound was adopted by the U.S. Mint for the regulation of coinage in 1828. The troy pound is equal to the apothecaries’ pound and to approximately 0.82 avoirdupois pound and 0.373 kilogram.” Encyclopedia Britannica.]