10 Pesos 1981 (The "Nut" Coin): What It's Really Worth

If you inherited a heptagonal Mexican coin with a man's profile on it and someone told you it's worth thousands, here's the honest answer: the 1981 10 pesos is worth roughly 1 to 2 USD in the condition most people find it. More than 222 million were struck that year. It is one of the most common Mexican coins of the 20th century, and the sky-high listings you see on MercadoLibre are asking prices, not sales.

That said, condition changes everything. A pristine, uncirculated example with full mint luster and sharp detail on Miguel Hidalgo's face can bring more than a worn one. Below is exactly what you have, what it's worth in 2026, and how to check before you sell.

What this coin actually is

The 1981 10 pesos (catalog reference KM 477.2) is a cupronickel coin struck at the Casa de Moneda de México, the Mexican Mint. It has a distinctive seven-sided curved shape, which is why Mexicans nickname it la tuerca, "the nut," as in a hardware nut. That shape ran from 1974 to 1985 and is one of the more recognizable designs in modern Mexican coinage.

• Metal: cupronickel, 75% copper and 25% nickel. No silver, no gold, no precious-metal value.
• Weight: 14.17 g
• Diameter: 30.56 mm
• Edge: reeded
• Reverse: Miguel Hidalgo y Costilla, the priest who launched Mexico's War of Independence, in profile facing left, with the words DIEZ PESOS (ten pesos).
• Obverse: the Mexican national coat of arms, an eagle devouring a serpent.

The 1981 date belongs to the thick-flan series (KM 477.2) struck from 1978 to 1985. These are heavier than the first "nut" coins from 1974 to 1977, which weighed about 10 g. So if yours feels solid and hefty, that's normal for this type.

What it's worth in 2026

Because it contains no precious metal, this coin has no bullion floor. Its value is purely numismatic and driven almost entirely by condition.

These are collector prices for the common 1981 date. There is nothing rare about the year itself. The reason the coin is worth pennies to a few dollars, and not thousands, is simple: over 222 million were minted in 1981 alone. Millions still exist. Rarity, not age, drives value, and this coin isn't rare.

The myth: "worth thousands" listings

You will find this coin listed for tens of thousands of pesos, sometimes hundreds of thousands, on classified platforms. Those are fantasy asking prices posted by people hoping a tourist or a novice bites. They are not completed sales. No serious dealer or auction house pays anything close to that for a common 1981 tuerca. If you want to know what a coin truly sells for, look at what buyers actually pay, not what optimistic sellers ask.

When it can be worth more

A few situations do add real value:

1. True Mint State examples. A coin that never circulated, with original luster and crisp relief on Hidalgo's portrait, is genuinely scarce and worth a premium over a worn one. Certification by NGC or PCGS can confirm this.
2. Genuine mint errors. Off-center strikes, double strikes, and major planchet errors are collected. A verified, correctly attributed error can be worth more than a common coin. Be careful: most "errors" people spot are just post-mint damage, which adds nothing.
3. Bust engraving varieties. Some collectors chase minor differences in the Hidalgo portrait engraving. This is a niche pursuit and rarely moves value dramatically.

The vast majority of 1981 tuercas that circulated have none of these features and are worth the table figures above.

How to tell if yours is worth checking

• Look at wear. Hold it under good light. If Hidalgo's face and hair are sharp and the field is shiny, you may have a better piece. If it's flat and gray, it's a common circulated coin.
• Weigh it. A genuine thick-flan 1981 weighs 14.17 g. Big deviations suggest a problem.
• Confirm the shape and edge. Seven curved sides, reeded edge. This is a hard coin to fake because it was never valuable enough to counterfeit.
• Get it graded only if it looks uncirculated. Grading fees exceed the value of a circulated coin, so only submit standout examples.

Is it still legal money?

No. The 1981 10 pesos was demonetized on December 31, 1992, when Mexico introduced the Nuevo Peso (new peso) and dropped three zeros. It has no spending power today. Any value it has is strictly as a collectible.

Where to sell it

Because this is such a common coin, your best move is to compare offers from people who genuinely buy and sell Mexican coinage, not classified-ad sellers with inflated prices. Check the Pesoteca shop directory to find reputable buyers. For context on other coins from this era, see our guides to modern Mexican circulating coinage and silver Mexican coins worth real money, since those are the pieces where the numbers actually get interesting.

Got a box of old Mexican coins beyond this one? Post clear photos in the Pesoteca forum and we'll help you sort the common circulated pieces from anything worth grading.

Mexican circulating peso coins from the second half of the 20th century were minted in alloys that changed according to the cost of metals and inflationary processes: .720 silver in denominations $1, $5, $10, $25 during the 1940s-50s; cupronickel from the 1970s on; aluminum bronze and stainless steel in the 1980s; pieces with figures (Hidalgo, Cuauhtemoc, Juarez, Madero) in the late 1980s just before the transition to Nuevos Pesos in 1992. 1981 corresponds to the period in which this variant was in circulation.