Mexican 10 Pesos 1975 (7-Sided Hidalgo Coin): Value

If you inherited or found a seven-sided Mexican 10 pesos dated 1975, here's the honest answer up front: in circulated condition it's worth roughly 1 to 5 USD. It's copper-nickel, not silver, so there's no precious-metal value to fall back on. The rare exceptions are coins in pristine uncirculated grade or with a verified mint error, which can bring more.

This is one of the most recognizable modern Mexican coins because of its shape. Most people who reach this page pulled it out of a jar or an old collection and assumed the odd shape meant it was special. The shape is genuinely unusual, but the coin itself was minted in large numbers and circulated heavily, so most examples are common.

What this coin actually is

The 1975 10 pesos is a copper-nickel coin with a heptagonal (seven-sided) outline, struck at the Casa de Moneda de México (the Mexican Mint). The front (obverse) carries the Mexican national coat of arms, an eagle on a cactus devouring a serpent. The back (reverse) shows the portrait of Miguel Hidalgo, the priest who launched Mexico's war of independence in 1810 and appears on much of the country's coinage from that era.

This is an "old peso" coin, from before Mexico revalued its currency in 1993 (when 1,000 old pesos became 1 new peso). That's why the denomination sounds high but the coin was ordinary pocket change at the time.

Specifications

Is it silver? No

This is the first thing US finders ask, and the answer matters for value. The 1975 10 pesos is copper-nickel. There is no silver or gold in it, so it has no melt value to speak of. Any value it has comes purely from collector demand and condition, not metal content. If you're looking for Mexican silver, the coins to check are older ones like the silver pesos and the Onza Libertad bullion coin, not this issue.

What drives the value

Because the coin is common, condition (grade) is almost the entire story:

• Circulated, worn: 1 to 3 USD. This is what most inherited examples are.
• Nice circulated with clean edges: 3 to 5 USD.
• Uncirculated with original mint luster and sharp seven-sided edges: the premium tier. These are the pieces that separate from the pack, but even here you're talking a modest premium, not a fortune.

Because it circulated so much, mid-grade examples are everywhere. Coins that kept their original shine and crisp corners on the heptagon are the ones collectors pay up for. Look closely at the high points of Hidalgo's face; that's where wear shows first.

Do mint errors add value?

Genuine, verifiable mint errors (off-center strikes, die rotation, double strikes) can multiply the value of a common coin. Most "errors" people post online, though, are post-mint damage: dents, scratches, corrosion, or wear that happened after the coin left the mint. Those add nothing. If you think you have a real error, get a second opinion before you assume it's worth money.

How to check what yours is worth

1. Weigh and measure it. Use a jewelry scale and a caliper. A genuine coin weighs 10.28 grams and measures 30 mm. Wrong weight or diameter, a flat lifeless relief, or odd color usually signals a fake or a damaged piece.
2. Grade it honestly. Look at Hidalgo's face and the eagle for wear. Original shine and sharp edges mean a better grade and a better price.
3. Photograph it. Clear shots of the obverse, reverse, and edge under good light.
4. Compare against real sale prices before you accept any offer, so you don't sell a nice example for pocket-change money.

Where to sell it

For a common coin like this, your best options are a verified numismatic shop from the Pesoteca directory, which can value it on the spot, or the Pesoteca buy-and-sell forum, where you deal directly with collectors. Skip dumping it to the first bidder on social media. For an ordinary circulated example, the realistic outcome is a few dollars, so the goal is a fair price, not a payday.

Have one of these seven-sided coins sitting in a drawer and want a second set of eyes on the grade? Post your photos in the Pesoteca forum and let the community weigh in before you sell.

Issued during the Estados Unidos Mexicanos, the official name adopted from the Constitution of 1857. Banxico records a run of 10 pieces for the year 1975. Referenced in the Harper catalog, North American Coins & Prices.