Mexico 100 Pesos 2005: Bank of Mexico 80th Anniversary Silver Coin

If you found a Mexican 100 Pesos coin dated 2005 with a bank note design on the back, here is the straight answer: it is a genuine silver commemorative, and it has a real floor value tied to its silver content. It is not a million-dollar rarity, but it is worth far more than face value. In 2026, most examples trade in the range of roughly 35 to 90 US dollars depending on condition, with pristine certified pieces reaching higher.

This is the coin Mexico's central bank, the Banco de México, issued in 2005 to mark its 80th anniversary (LXXX Aniversario). It was struck for one year only, which limits the supply.

What it's worth right now

The value starts with the metal. This coin weighs 33.967 grams and is 39 millimeters across, which puts its silver weight right around one troy ounce. That means it will never be worth less than the melt value of its silver, and that floor moves with the spot silver price.

On top of the metal, collectors pay a premium for the commemorative design and for high grade. Coins still sealed in the original Banxico blister pack, or graded by NGC or PCGS, command the top prices.

Condition	Approx. value (USD)
Circulated / handled	30 to 45
Uncirculated (raw, clean)	45 to 70
Sealed in original Banxico pack	60 to 90
Certified MS-68 or higher (NGC/PCGS)	90 and up

These are working ranges for 2026. Actual sale prices swing with the silver spot price and with how much a specific buyer wants the piece that week.

What you actually have

The metal: silver, roughly one troy ounce of fine content. That is why this coin has a hard value floor.

The obverse (front): the Mexican national coat of arms in sculptural relief, with the legend ESTADOS UNIDOS MEXICANOS arcing across the top. (ESTADOS UNIDOS MEXICANOS is simply the formal name of Mexico, and it appears on nearly all Mexican coinage.)

The reverse (back): a horizontal reproduction of the back of a 1925 one-hundred-peso banknote, showing the Angel of Independence (the Columna de la Independencia monument in Mexico City). You will also see the peso symbol, the number 100, the inscription LXXX ANIVERSARIO, the year 1925, the Banco de México emblem, the year 2005, and a small M with a circle above it, which is the mint mark of the Casa de Moneda de México, the Mexican Mint.

The edge is reeded with an interrupted (discontinuous) pattern, which is a useful authentication check.

Is it rare?

Not rare in the collector sense of a few surviving examples, but not common either. The exact mintage was never officially published by the Banco de México, which usually points to a limited numismatic release rather than a mass circulation strike. Because it was struck only in 2005, there are no year varieties to chase. What separates a 40-dollar coin from a 90-dollar coin here is condition and certification, not date.

The myth to ignore

A silver commemorative like this gets talked up online as a hidden fortune. It isn't. Its value is real and steady, but it is anchored to silver plus a modest collector premium. If someone tells you a 2005 100 Pesos is worth thousands, ask them for the auction record, because there isn't one at that level for a normal example. Genuine minting errors (off-center strikes, die rotation, doubled dies) can multiply the value, but most so-called errors floating around social media are post-mint damage: dents, scratches, and corrosion, not factory flaws.

How to tell if yours is genuine

Because this coin is silver, fakes exist. Run these checks before you buy or sell:

1. Weigh it. A real example weighs 33.967 grams. If your scale reads meaningfully off that, be suspicious.
2. Measure it. Diameter should be 39 millimeters.
3. Check the relief. Compare the detail against official Banco de México images. Counterfeits tend to have flat, mushy relief, especially on the coat of arms.
4. Look at the edge. The reeding is discontinuous, not a smooth continuous pattern.
5. Certify high-value pieces. If your coin is clean and you think it is uncirculated, sending it to NGC or PCGS for grading is the definitive check and it raises the resale value.

For a full walkthrough on assessing wear and condition, see our coin grading guide.

Where to sell it

Your realistic options, ranked by safety:

• A verified numismatic dealer from the Pesoteca shop directory. They appraise on the spot and pay closer to real market value than a pawn shop, which will only offer melt.
• The Pesoteca buy-and-sell forum, collector to collector, where a silver commemorative like this finds informed buyers.
• Online marketplaces, which can bring good prices but carry the most counterfeit risk. If you sell there, post clear photos of the front, back, and edge, plus the weight, so a serious buyer trusts you.

Before you list it, photograph all three sides (obverse, reverse, and edge) and check your condition against the ranges above. Never dump a silver coin on the first lowball offer.

Think you might have a minting error or a top-grade example? Post clear photos in the Pesoteca forum and let the community weigh in before you sell.