Coin Type Specifications
Region: Mexico
Denomination: PESO
Diameter: 29 (mm)
Coin Metal Composition:
Copper [75%] 6.75 (g)
Nickel [25%] 2.25 (g)
Total Mass: 9 (g)

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1970-1983 Mexican Un Peso
Coin Type Name

Mexico - 1970-1983 Mexican Un Peso

Obscure Finds Coin Collection > Mexico > 1 Peso

This section of Obscure Finds Numismatic Collection is made up of coins from the Mexico region and specializes in 1970-1983 Mexican Un Peso coins from coin category 1 Peso . If you are looking for coin facts, numismatic data or simple melt value composition of the Mexico - 1970-1983 Mexican Un Peso coin, you can find it here at Obscure Finds.

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Coin Type Coins
1970-1983 Mexican Un Peso Coin Composition
Composition Totals From 2 Coins
Copper : 13.5 Grams
Nickel : 4.5 Grams
Total Mass : 18 Grams

Metal USD/Pound USD/Troy Ounce USD/Gram Grams/Coin USD/Coin
Copper $2.091 $0.143 $0.005 6.75 g $0.031
Nickel $4.494 $0.308 $0.010 2.25 g $0.022
Precious and Base Metal Melt Value For Each Coin: $0.053
Combined Precious and Base Metal Melt Value For 2 Coins: $0.107
- Precious Metal prices updated on 07-25-2024
2 Example Coins Found...


Coin Type Description
This information is compiled/referenced data from around the web. Linked references within.
Years Minted: 1970-1983
Mint Marks: M
Denomination: PESO
Obverse Design: The linear Seal of the United Mexican States
Obverse Designer:
Reverse Design: A portrait of José María Morelos facing left
Reverse Designer:
First non-silver issue (1970-1983)

Mexico issued a 1 peso coin from 1970 to 1983 that was unlike any circulated coin of the denomination that came before it. The coin is made of cupronickel instead of silver. It weighs 9 grams and has a diameter of 29 millimeters. The linear Seal of the United Mexican States, including the words "ESTADOS UNIDOS MEXICANOS", is present on the obverse. A portrait of José María Morelos facing left is present at the right side of the reverse. The value "UN PESO" is inscribed to the left of the image, the "Mo" mint mark of the Mexican Mint is featured to the right, and the year of minting is printed below. A large quantity of these coins were struck by the Mexican Mint in several different varieties over a span of fourteen years. For 1970 and 1979, coins with narrow and wide dates were produced. Similarly, in 1975, "short wide date" and "tall narrow date" varieties were made, and in 1977, "thick" and "thin" date coins were minted. For the years 1978, 1980, 1981, and 1982, varieties exist with an open and closed "8" in the date. There are three known varieties for 1983: a "narrow date" variety, a "wide date" variety, and a proof variety.

Two cupronickel patterns of the coin were produced in 1969. One of the patterns features the value to the right of Morelos' head instead of to the left, while the other uses a slightly different portrait than the one used on the circulated coin.
Word Count: 242 -
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Precious Metal prices on this page were last updated on 07-25-2024
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Base Metals Last Updated: 09-01-2016