That's Miss Liberty (LIBERTAD) on the front and a wreathed denomination (5, 10, 20, or 50 centavos) on the back. These coins are made of steel with a coating that contains nickel. They are worth face value in Argentina.
Collectors will buy these coins for their collections. When they do, they will pay a few US dollars for fully uncirculated specimens. All dates and denominations are roughly equal in value. The 1961 20 centavos is a slight bit rare, so a fully uncirculated coin might sell for $3 to $4.