All Peace dollars are made from 90% silver & 10% copper.
1922 Peace dollars were minted in Philadelphia, Denver, and San Francisco.
Silver U.S. coins dated 1964 and earlier are made of an alloy of 90% silver and 10% copper. An unworn Peace dollar weighs 26.7 gm so it contains about 25 gm of silver.
No Eisenhower dollars were made until 1971, the coin is a Peace dollar and assuming the coin is circulated and has no mintmark. The 1922 Peace dollar is so common, circulated examples are only $16.00 to $20.00 retail. Mint State examples run from $25.00-$35.00
The last Morgan dollars were minted in 1921. The Peace design was introduced in December of that year, so any silver $1 coin dated 1922 would be a Peace dollar, just as it says on the coin's back side. The last Morgan silver dollars were minted in 1921. Your coin is called a Peace dollar. A 1922 peace dollar that was made at Philadelphia in circulated condition is worth an average of $25. This reflects the silver content. If it shows significant wear it won't be worth much more than that. If it is uncirculated they are worth up to $900 depending on quality.
Technically a Peace dollar is a Liberty dollar because all silver dollars minted up till 1935 carried a picture of Miss Liberty, but not all Liberty dollars are Peace dollars - only those made with the specific PEACE design from late 1921 to 1935 are Peace dollars. Normally each type of silver dollar is given a more specific name based on its design, e.g. "Seated Liberty", "Flowing Hair", or Morgan or Gobrecht for the artists who designed them.
No, the last silver dollar intended for circulation that actually contained silver was the Peace Dollar, last struck for circulation in 1935.
The mintmark on a Peace dollar is located below the word ONE on the back of the coin. Keep in mind that if it was made at the Philadelphia mint it won't have a mintmark.
Check the coin again and you should see that it is a peace dollar. Susan B Anthony dollars were made from 1979 to 1981 and again in 1999. The answer to the question is no a peace dollar does not stick to a magnet. This is because it is made of 90% silver and 10% copper and neither have magnetic properties. A Susan B Anthony dollar won't stick either.
Peace dollars were made from 1921 to 1935. An 1879 silver dollar is called a Morgan dollar after its designer George T. Morgan. There's more information at the Related Question
The Silver Peace dollar was the silver dollar to come after the Morgan Silver Dollar (1878-1921). The Peace dollar was made from 1922-1935) It is composed of .900 silver. It is 90% silver and 10% copper. A Peace Dollar is a silver dollar struck by the US mint for circulation from 1921-1935. It features Liberty on the obverse with a radiate crown, the reverse shows a bald eagle perched on a rock with an olive branch and the rock in inscribed "PEACE". The coin was struck to commemorate the end of WWI. Coins were minted in 1921 (that year was the final year for the Morgan Dollar also), 1922, 1923, 1924, 1925, 1926, 1927, 1928, 1934, 1935. The 1921 issues are highly prized because they are struck in high relief and the 1928 (no mintmark) coins are considered to be the "key date" and sell for much higher than bullion pricing. Pieces struck in common years like 1923 and 1924 unless flawlessly uncirculated sell for bullion prices which at the time of writing range from around $22-29 or so.
The first PEACE dollar was struck in 1921 , the date 1902 is a MORGAN dollar that's valued at $35.00-$50.00 in circulated condition. Peace dollars were made from 1921 to 1935.
All silver dollars minted up to 1935 were made of 90% silver and 10% copper. 1921 Peace dollars are fairly scarce; please see the Related Question for more.