That's a nice old silver sol from Peru. These coins are made from 50 percent pure (5 decimos fino) silver, so they are valuable just due to their silver content. There are 0.402 troy ounces of silver in a one sol coin. Multiplying this by the current price of silver (available from web sites such as kitco.com) gives you the basic value of the coin.
For instance, if silver is selling at $15 US dollars per troy ounce, there base value is 0.402 x 15 = $6 base value. The price of silver changes every day, so be sure to look it up.
If your coin is in nice shape, with little wear and lots of eye appeal, collectors will pay about $15 over base value for your coin. If you are selling your collectible coin, figure a dealer will buy it for about base value, probably less.
The numbers above apply to all the dates in the series except the 1933, which carries a collector premium about twice as large as the common coins, i.e., $30 not $15 for a well preserved, nice looking coin.