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
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The Morgan Silver Dollar can range from $25 to $70, and the Peace Silver Dollar from $50 to $300.
The first Peace dollars were struck in 1921.
Year: 1922D Mintage 15,063,000 Numismatic Value Range: $14 - $400$8.6870102468 is the total melt value for the 1921-1935 silver Peace dollar on January 16, 2009.ref:http://www.coinflation.com/coins/1921-1935-Silver-Peace-Dollar-Value.html
1879 S is not a rare date for Morgan dollars. On average if they are in circulated condition they are worth $16.50.
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.