1-Kilo Silver Aztec Calendar 100 Pesos (2013): Value & Prices

If you inherited a massive silver coin the size of a small plate stamped "100 Pesos" with the Aztec Calendar on it, you're holding a serious chunk of silver. The 2013 1-kilo Calendario Azteca contains one full kilogram of .999 fine silver, which sets a hard price floor at melt value. In 2026, that floor alone runs well over 1,000 US dollars, and clean certified examples sell for more.

This is not a rare, million-dollar rarity. It is a modern bullion-and-collector piece from the Banco de México (Banxico), Mexico's central bank. Its value comes almost entirely from the silver it holds plus a modest collector premium, not from age or scarcity.

What it's actually worth in 2026

Start with the metal, because that's the anchor. This coin weighs 1,000 grams of .999 fine silver, which is about 32.15 troy ounces. Multiply the current silver spot price by 32.15 and you have the melt value. That number moves daily with the market, so check a live silver price before you buy or sell.

On top of melt, expect a premium for the finish, the original Banxico packaging, and condition. The "mate-brillo" (matte-and-mirror, or reverse-proof-style) finish is a display piece, and collectors pay extra for one that is spotless and still in its original capsule and box.

Item	Detail
Denomination	100 Pesos
Year	2013 (single year of issue)
Metal	Silver, .999 fine
Weight	1,000 grams (about 32.15 troy oz)
Diameter	110 mm
Edge	Smooth
Design	Aztec Calendar (Piedra del Sol), matte-and-mirror finish
Issuer	Banco de México (Banxico)

Rough value ranges (USD)

• Loose, worn, or scratched: essentially melt value, whatever 32.15 troy ounces of silver is worth that day.
• Clean, in original Banxico capsule and box: melt value plus a premium of roughly 100 to 300 dollars, depending on demand and how complete the packaging is.
• Certified in a high grade by NGC or PCGS: the strongest premiums, since a slabbed high-grade example removes any doubt about authenticity and condition.

We won't quote a fake exact price, because the silver spot swings and the collector premium varies. The honest answer: it's a solid four-figure coin in most cases, driven mainly by its silver.

Is it rare?

Banxico did not publish an official mintage for this specific issue, which usually means it came out in a limited numismatic set rather than for circulation. That makes it scarcer than everyday coins, but "limited" is not the same as "rare and valuable beyond its metal." There are enough of these around that you can find buyers and sellers, and the market prices it accordingly. Anyone claiming this coin is worth tens of thousands because of rarity is selling hype. The silver is the story.

Because it was struck only in 2013, there are no year variants to chase. Minor die varieties can exist, but only NGC or PCGS graders reliably identify them, and for most owners a coin is a coin.

How to tell if yours is genuine

A 1-kilo silver coin is worth enough to attract fakes, so verify before you pay or sell.

1. Weight and size. It must weigh 1,000 grams and measure 110 mm across. A cheap kitchen scale and a ruler catch most fakes. If your piece is light or undersized, walk away.
2. The ring test. Genuine .999 silver produces a clear, high, sustained ring when balanced on a fingertip and tapped gently. Base-metal fakes sound dull and short.
3. Original packaging. Legitimate examples come in a Banxico capsule and presentation box. Packaging is not proof by itself, but its absence on a "mint" piece is a flag.
4. Certification. For a coin worth this much, third-party grading by NGC or PCGS is the definitive answer. A slab confirms both authenticity and grade.

Where to sell it (or buy one safely)

Because the value is mostly precious metal, sell where the buyer can see and weigh the coin.

• A verified coin shop from the Pesoteca directory will appraise it on the spot and pay close to melt plus premium.
• The Pesoteca buy-and-sell forum connects you directly with collectors, often at better prices than a quick flip.
• Online marketplaces can work, but they carry the highest fake risk. Always demand photos of the edge and the actual weight from the seller.

Photograph the obverse, reverse, and edge before you list it, and check the value ranges above so you don't undersell. Don't dump it on the first social-media offer.

The bottom line

This is a genuine kilo of investment-grade silver wearing one of Mexico's most iconic designs. As a metal holding it has a permanent floor and always finds a buyer. As a collector piece it carries a modest premium in top condition, but don't expect a rarity windfall. Buy it for the silver, keep it in its capsule, and it holds its value.

Got one of these sitting in a drawer and want a read on condition before you sell? Post clear photos of both sides and the edge in the Pesoteca forum and let the community weigh in.