Some are and some are not.
The Centavo denomination was first used in Mexico in 1864.
Cinco Centavos (Spanish for "Five Cents") coins issued under the Empira Mexicana ("Mexican Empire") were 90.3% silver from 1864 through 1866 .
Cinco Centavos coins issued under the Republica Mexicana ("Mexican Republic") were 90.3% silver from 1868 through 1905 (except 1882 and 1883, when they were made from copper-nickel).
Cinco Centavos coins issued under the Estados Unidos Mexicana ("United Mexican States") were made from nickel 1905-1914 (20mm in diameter), bronze 1914-1935 (28mm in diameter), copper-nickel 1936-1942 (20.5mm in diameter), bronze1942-1955 (25.5mm in diameter), copper-nickel 1950 (20.5mm in diameter), brass 1954-1969 (20.5mm in diameter), copper-nickel 1960,1962 and 1965 (20.5mm in diameter), brass 1970-1976 (18mm in diameter), stainless steel1992-onward (15.58mm in diameter).
If it says "Ley 999" somewhere in the face, it should be 99.9% of an ounce of silver. Otherwise, it is just an alloy of zinc and copper.
I have a 1934 "un peso" silver 720 peso, what is it worth?
1940 silver peso
A 1921 Mexican 1 Peso coin contains 0.3856 troy ounces of silver.
0.3856 troy ounces of silver
yeah it is 10%
Mexican peso
A 1964 Mexican Peso is 10% silver (although mostly on the outside - the middle of the coin has basically no silver at all) and contains 0.0514 troy ounces of silver (about 65 US cents worth). Numismatically, the coin is worth about US$0.85 in Extremely Fine condition (very little wear) and about US$2.00 in Brilliant Uncirculated condition.
From 1821 until 1905.
0720 oz
Years Minted: 1910-1914Composition: 90.3% SilverDiameter: 39 mmWeight: 27.07 grams (.7859 oz of silver)Obverse Design: National ArmsReverse Design: Liberty on HorseShortly after the Mexican Revolution, the newly formed Mexican Government issued their first Peso coin referred to as the "Caballito Peso" or as translated to English Pony or Small Horse Peso.From 1572 (perhaps even earlier) and up to 1914, the silver content of the Mexican Peso (which during the Spanish Colonial era was known as the "Piece of Eight Reales") was held to a remarkably stable standard: 24.44 grams of pure silver.
The 1966 Mexican peso is about ten percent silver so its value fluctuates with the silver market. Its value also fluctuates depending on the wear of the coin.
it is worth $1.000.000.000 in New Zealand.