1 Kilo Silver Aztec Calendar 100 Pesos (2012): Value Guide

If you inherited or found a 2012 Mexican 1-kilogram silver coin with the Aztec Calendar (Calendario Azteca) on it, here is the fast answer: this is a real bullion coin, and it is worth serious money. A full kilo of .999 fine silver alone carries a floor value that tracks the silver spot price, currently well over 1,000 USD as of 2026. In pristine condition with original packaging, collectors pay more.

This is not one of those "old coin that turns out to be worth a few dollars" situations. A kilogram of pure silver is a kilogram of pure silver. It has a hard floor.

What you actually have

The face value stamped on the coin is 100 pesos, but ignore that number. That is symbolic. The real value comes from the metal and from collector demand. Here are the exact specifications, which also double as your authenticity checklist:

• Weight: 1,000 grams (1 full kilogram)
• Diameter: 110 millimeters (about 4.3 inches, larger than a coaster)
• Metal: .999 fine silver (99.9% pure)
• Edge: smooth (plain)
• Year: 2012, a one-year issue
• Design: the Aztec Calendar (Piedra del Sol) in a matte-and-mirror finish, called mate-brillo in Spanish

The "mate-brillo" finish means parts of the coin are frosted (matte) while the fields are mirror-polished. This is a proof-style presentation piece, not a coin that was ever meant to jingle in a pocket.

What it's worth in USD

Value splits into two floors. The first is melt value: a kilogram of pure silver. As of 2026, one kilo of silver runs well over 1,000 USD, and that number moves daily with the market. That is your absolute minimum. Nobody serious will offer you less than the silver content.

The second floor is the collector premium. Because this was a limited numismatic release sold in official Banco de México (Banxico) sets rather than a mass-circulated coin, clean examples with original packaging command more than melt.

Condition	What it means	Estimated value (USD)
Damaged / scratched	Handled, hairlines, no box	Silver melt value (floor)
Uncirculated, no box	Clean but loose	Melt plus a modest premium
Uncirculated with original Banxico case	Complete, as issued	Melt plus meaningful collector premium
Certified (NGC/PCGS high grade)	Slabbed, top condition	Highest, sold to serious collectors

We are giving ranges rather than one fixed price because the silver spot price changes constantly and because a 2012 exact mintage figure was never published by Banxico. When the mint does not release a number, it usually means the coin came out in a restricted numismatic set. Collector forums throw around figures, but none are confirmed, so treat any "only X exist" claim with skepticism.

The myth to ignore

Search around and you will see people claiming Mexican silver coins are worth "a fortune" or tens of thousands. For this specific piece, that is not reality. Its value is anchored to the price of silver plus a collector premium. It is a genuinely valuable object because it contains a kilogram of pure silver, not because of some mysterious rarity. Do not let a hopeful seller or a clickbait video convince you it is a museum-grade treasure worth 50,000 dollars. It isn't.

The flip side: do not let a dishonest buyer tell you it's "just a novelty coin" worth face value. A full kilo of .999 silver has a hard, verifiable floor. Weigh it, check the silver spot price, and you know your minimum before you ever talk to anyone.

How to tell if yours is genuine

With a piece this valuable, fakes exist. Run these checks before you sell:

1. Weigh it. A genuine coin weighs 1,000 grams. Any kitchen scale will do. If it's off by more than a gram or two, be cautious.
2. Measure it. Diameter should be 110 millimeters. Counterfeits often miss the exact dimensions.
3. The ping test. Balanced on a fingertip and tapped gently, real .999 silver rings with a high, sustained tone. Plated or base-metal fakes sound dull and short.
4. Get it certified. For a coin worth over 1,000 USD, professional grading from NGC or PCGS is worth the fee. A slab is your definitive proof of authenticity and grade, and it raises resale value.

Where to sell it

Because this is a precious-metal piece, you have real options, and you should never take the first lowball offer:

• A verified numismatic shop will appraise it on the spot and can buy directly. Use the Pesoteca shop directory to find one by city.
• The Pesoteca buy-and-sell forum puts you in front of collectors who understand what a kilo silver coin is actually worth.
• Precious-metal dealers will always give you at least melt value, which is your safety net.

Before you sell anything, photograph the coin front, back, and edge, weigh it, and check the current silver spot price so you know your floor. Avoid dumping it on a general marketplace at the first offer, and never ship a valuable coin before payment clears.

Got the 2012 kilo Aztec Calendar coin sitting in a drawer and want a second opinion on grade or authenticity before you sell? Post clear photos of both sides and the edge in the Pesoteca forum and let collectors weigh in.