100 Pesos 80th Anniversary Banco de México (2005)

If you inherited or found a large 2005 Mexican 100 Pesos coin marked "80 Aniversario Banco de México," the honest answer is this: it is a modern commemorative worth roughly 6 to 30 USD in circulated shape, more if it is uncirculated and certified. It is not a rare treasure, but it is not junk either. Here is exactly what you have and what to do with it.

Quick answer: what it's worth in 2026

This is a bimetallic commemorative (a coin with an outer ring of one metal and a center core of another), issued in a single year, 2005. Circulated examples typically trade for the equivalent of 6 to 30 USD. Uncirculated pieces that keep their original mint luster, and especially ones graded MS-65 or higher by NGC or PCGS, can bring 40 USD or more. It is a collector piece, not a jackpot.

What this coin actually is

Banco de México, the country's central bank, was founded in 1925. In 2005 it marked its 80th anniversary with this large commemorative. The coin measures 39 mm across and weighs 33.94 g, which makes it noticeably bigger and heavier than an ordinary circulating peso. The interrupted reeded edge (reeding that is broken up rather than continuous) is a security feature you can feel with a fingernail and a good way to spot a fake.

Banxico has a long habit of issuing special coins for its own anniversaries, so this piece belongs to a family of modern central-bank commemoratives. The bimetallic design was meant for display and for collectors, not for everyday change.

Is it rare? Honest take

No. This is a modern commemorative, and modern commemoratives are almost never rare in the numismatic sense. The exact mintage for this specific issue is not published by Banxico, which usually points to a limited numismatic release rather than a mass circulation run. That limited distribution gives it collector appeal, but it does not make it valuable the way a genuinely scarce 19th-century coin would be.

Where real money can appear is condition and errors. A coin frozen in mint state, with no rubs across its large open fields, is worth a clear premium over a beat-up one. Because the surfaces are big, every scratch and contact mark shows, so clean examples are genuinely worth hunting for.

What drives the value

Grade is the main factor. The difference between a circulated example and a certified MS-65 can be several multiples in price. Genuine mint errors (off-center strikes, die rotation, doubling) can also multiply value if they are verifiable, but be careful: most "errors" people post online are post-mint damage like dings and corrosion, not factory mistakes.

How to tell if yours is genuine

Start with the numbers. A real one weighs 33.94 g and measures 39 mm. If your coin misses those figures, that tells you something immediately. Compare the relief and lettering against official Banco de México images; counterfeits tend to have flatter, mushy detail. Check the interrupted reeded edge. For anything you think is high grade or valuable, certification by NGC or PCGS is the definitive safeguard, since a graded slab confirms authenticity and condition in one step.

Where to sell it

Your realistic options:

• A verified numismatic dealer from the Pesoteca shop directory, which can appraise it on the spot.
• The Pesoteca buy-and-sell forum, where you deal directly with collectors.
• Online marketplaces, which can work but attract the most counterfeits, so always demand photos of the edge and the weight.

Before you sell, photograph the obverse, reverse, and edge, and compare against the price range above so you know what a fair offer looks like. Don't dump it on the first buyer who messages you.

Should you get it graded?

Grading costs money, so it only makes sense if your coin is clearly uncirculated or you suspect a real error. For a worn example worth 20 USD, paying for certification wastes money. For a pristine, luster-full piece, a certified grade can more than pay for itself and makes selling far easier.

Think you have a mint error or an especially clean example? Post clear photos in the Pesoteca forum and let the community weigh in before you decide what to do with it.

The Bank of Mexico was founded on September 1, 1925, by decree of President Plutarco Elías Calles as the sole bank of issue. In 2005 it turned 80. This piece commemorates that milestone. Banxico's quarterly SM report indicates 0 pieces in circulation because it was an edition exclusively for collectors in a commemorative folder.