Nice coin in 1950 all silver ended in the Peso
By the end of the Revolution, the value of the Peso could not keep up with the value of its silver content. Starting in 1918, coin size and silver fineness decreased accordingly. Reference to silver content on coins pretty much was eliminated after 1950, at least in the Un Peso, and eventually all silver content would disappear in 1970 when a cupro-nickel Peso was introduced.