Mexico 20 Pesos Tenochtitlan 700th Anniversary (2021)

Found a large gold-and-silver-colored Mexican 20 pesos coin marked "700 Años de la Fundación Lunar"? Here is the honest answer: it is worth a few dollars, not the thousands you may have seen posted online. In 2026 an uncirculated example trades for roughly 3 to 5 USD. The "170,000 pesos" and "millions" listings are Facebook Marketplace fantasy with no real buyer.

This is a modern commemorative coin, issued by Mexico's central bank (Banco de México) in 2021 to mark 700 years since the founding of the Aztec capital, México-Tenochtitlan. It circulated at face value and is still legal tender. With a mintage of 30.5 million pieces, it is common, which is the single biggest reason it will never be a fortune.

What it is worth in USD

Value tracks condition. A worn coin pulled from change sits right at face value. A clean uncirculated (UNC) coin, meaning no wear and no spots, brings a modest collector premium. In the original Banxico blister pack it earns a little more for the sealed packaging.

Condition	Approx. value (USD)	Notes
Circulated	1.50 to 2.50	Close to face value
Uncirculated (UNC), loose	3 to 5	No wear, no spots
Sealed Banxico blister	5 to 8	Premium for packaging

Face value is 20 Mexican pesos, roughly 1 US dollar depending on the exchange rate. So even a circulated example is worth about what it says on it. That is normal for a modern commemorative pulled from a run of 30.5 million.

The coin's specs (keep these for authentication)

This is a bimetallic coin: an aluminum-bronze outer ring around a copper-nickel center.

• Weight: 12.67 grams
• Diameter: 30 millimeters
• Mintage: 30,500,000 pieces
• Year: 2021 only (no other dates exist)
• Series: C1 family of 20 peso commemoratives

If yours is off on weight or diameter, or the relief looks flat and the two metal colors are blurred, be suspicious. Genuine pieces hit those numbers exactly.

Why "lunar" founding, and how to identify it

The reverse shows the eagle from the Teocalli de la Guerra Sagrada monument at the center, with the microtext TEOCALLI, a latent-image moon glyph, and the legend 700 AÑOS DE LA FUNDACIÓN LUNAR DE LA CIUDAD DE MÉXICO-TENOCHTITLAN. The "lunar" name refers to the Mexica lunar calendar count dated to 1321, tied to the moon deity Coyolxauhqui, rather than the solar eagle-and-serpent symbol most people know. That later eagle-devouring-serpent image was a reinterpretation under the ruler (tlatoani) Itzcóatl.

That legend on the reverse is how you tell it apart from other 2021 twenty peso coins, like the Emiliano Zapata centennial and the Bicentennial of Independence.

The mint-error myth

Genuine minting errors (off-center strikes, die rotation, double strikes) can multiply the value of a coin. The catch: nearly all "errors" shown online are post-mint damage, meaning dings, scratches, and corrosion that happened after the coin left the mint. Those add nothing. If you think you have a real factory error, get it looked at before you get excited.

How to check and sell yours

1. Weigh it on a jewelry scale (should read 12.67 g) and measure the diameter (30 mm).
2. Grade it honestly: is it worn (circulated) or clean with no wear (UNC)? Spots kill the premium.
3. Photograph the obverse, reverse, and edge in good light.
4. Sell through a verified numismatic shop from the Pesoteca directory, which will appraise it on the spot, or the collector buy-and-sell forum. Skip dumping it on Facebook to the first offer.

Think you spotted something unusual on your coin? Post clear photos in the Pesoteca forum and let the community weigh in before you list it.

This coin is born from a major commemoration: the 700 years of the lunar founding of Mexico-Tenochtitlan, the Mexica city that would later become the capital of the country. Legend has it that the Mexica, guided by Huitzilopochtli, wandered until they found the promised sign: an eagle perched on a cactus that sprouted from the heart of Copil, on an islet of Lake Texcoco. There they raised their altar and their city.

Watch out for the surname "lunar." Most historians (Matos Moctezuma among them) date the founding to 1325, even linked to an eclipse. The count of 1321 corresponds to a lunar count of the Mexica calendar, and it is that one the government took as the basis to commemorate in 2021, the same year in which the 500 years of the historical memory of Tenochtitlan and the Bicentennial of Independence were also remembered.

Banxico put it into circulation on September 21, 2021, with a maximum mintage of 2,000,000 pieces. The eagle at the center comes from the Teocalli of Sacred War, a Mexica monolith that ties the design to the founding myth.

Why "lunar": the myth of Copil

The surname "lunar" has its root in a specific myth. Copil, son of Malinalxóchitl (the sorceress sister whom Huitzilopochtli abandoned along the way), sought revenge and confronted Huitzilopochtli. He lost: they tore out his heart and threw it into the lake, and from that heart, upon a stone, the cactus sprouted. That is the "lunar tunal," the cactus that is born from the water and not from the sun, linked to Coyolxauhqui, deity of the moon. The solar symbol of the eagle devouring the serpent that today appears on the coat of arms is a later reinterpretation, made under the tlatoani Itzcóatl to represent the victory of the sun over the moon. That is why this piece does not commemorate the founding of the national coat of arms, but the lunar one, and its name says so in full.

How to identify it in the hand

The reverse is your only guide, because the obverse is the standard National Coat of Arms of the whole C1 family. At the center is the eagle of the Teocalli of Sacred War with the microtext "TEOCALLI" hidden in the design; on the right, the moon glyph as a latent image, that detail that changes according to how the light hits it. Above runs the legend "700 AÑOS DE LA FUNDACIÓN LUNAR DE LA CIUDAD DE MÉXICO-TENOCHTITLAN" and in the exergue are the denomination, the year 2021 and the Mo mint mark. There are no year variants: only the 2021 exists, so a supposed "2020 one" or "2022 one" doesn't add up. The microtext and the latent glyph are exactly what the fakes rarely replicate well.

What it's really worth

The stories of "sells for up to 1.6 million" are clickbait titles: they are Marketplace listings where the seller dreams up the price and there it stays, with no buyer. With a mintage of 2,000,000 pieces this coin went into real circulation and is not scarce. The real value depends on condition: circulated, between 25 and 40 pesos; uncirculated (UNC) and loose, between 50 and 90 pesos; in an official Banxico blister, a bit more for the packaging. That range of tens of pesos is the correct one; if a hustler offers it to you in the hundreds or thousands, keep walking. To buy or sell it at a fair price, use the store directory. Compared to the truly hard-to-hunt ones in the series, like the Taking of Zacatecas, this one enters the collection easily and shines for its reverse.