The coin bears a stylized image of Miss Liberty, as was common with most coins of the period. However, the designer, Anthony de Francisci, did not work from his imagination - the model was his wife Teresa.
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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).
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.
It looks the same as any other Peace dollar.
A 1923 Peace dollar is very common and has values of $25.00-$27.00 in circulated condition.
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.