1 Kilo Silver Aztec Calendar 100 Pesos (2015): Value & Where to Sell

If you inherited or found a huge silver coin the size of a small plate with the Aztec sun stone on it, you have something real. The 2015 Aztec Calendar 100 pesos holds one full kilogram of .999 fine silver. In 2026, its floor value tracks the silver market: at roughly 30 USD per troy ounce, the metal alone is worth over 1,000 USD, and a pristine piece sells for more. This is not one of those old coins worth pocket change.

What you actually have

The coin is a 1 kilo (1,000 gram) silver piece struck by the Casa de Moneda de México (the Mexican Mint) in 2015. Full specs:

• Metal: .999 fine silver (99.9% pure)
• Weight: 1,000 grams (about 32.15 troy ounces)
• Diameter: 110 mm (about 4.3 inches, larger than a hockey puck is wide)
• Edge: plain (smooth)
• Finish: matte-brilliant (called mate-brillo), a special collector finish that contrasts satin and polished areas for depth
• Face value: 100 pesos (this is symbolic; the coin is worth far more than 100 pesos)

The named side reproduces the Piedra del Sol, the Aztec sun stone monolith now housed in the National Museum of Anthropology in Mexico City. On a disc this large, the detail is sharp: the rings of day signs, the sun rays, and the face of Tonatiuh at the center read cleanly, which is exactly why the 1 kilo format is the most desirable size in the series.

How much is it worth

Two things drive the price: the silver content and the condition.

The floor is melt value. With 32.15 troy ounces of pure silver, the coin can never be worth less than the metal. As of recent silver prices, that puts the base around 1,000 to 1,100 USD. Silver moves daily, so check the current spot price and multiply by 32.15 for the metal floor.

Above melt, condition is everything. On a 110 mm disc, every scratch, fingerprint, or handling mark shows instantly. Flawless, well-stored examples command a premium over melt. Damaged or heavily handled pieces trade closer to bullion value.

Coin	Year	Metal content	Value floor (metal)	Notes
100 Pesos Aztec Calendar, 1 Kilo	2015	1,000 g .999 silver (32.15 oz)	~1,000 to 1,100 USD	Premium above melt for flawless matte-brilliant pieces

A quick honest note: exact mintage figures for this issue are not published by the Mexican central bank. That usually means limited numismatic sets or a small strike run, which supports the premium, but no confirmed survival numbers exist. Do not trust anyone quoting an exact mintage as fact.

Is it rare?

Large-format silver coins are always struck in small quantities, and the 1 kilo is the top of the series by size. That makes it scarce by nature, but scarce is not the same as legendary. Its value rests on real silver weight plus collector demand for the Aztec Calendar design, one of the most recognizable in Mexican silver. Treat it as a centerpiece coin, the kind that anchors a collection, not one you find in a coffee can by the dozen.

How to tell if it's genuine

Because the metal alone is worth over 1,000 USD, fakes exist. Check these before you buy or sell:

1. Weight and size. It must weigh exactly 1,000 grams and measure 110 mm across. A kitchen scale and a ruler catch most fakes instantly. Anything off on weight is a red flag.
2. The ping test. Genuine silver rings with a high, sustained tone when tapped gently. Fakes sound dull and short. This is a quick screen, not proof.
3. Certified grading. For a coin at this value, the definitive answer is third-party grading from NGC or PCGS. A certified, sealed piece removes all doubt and sells for more.

If you are buying, only deal with a seller who will show you the coin, its weight, and clear photos of both faces and the edge. Verify before you pay.

Where to sell it

You have a bullion coin with a collector premium, so you want a buyer who understands both. Options that work:

• Precious metal and coin dealers. They will pay at least melt value on the spot, and more for a pristine or certified piece. Get more than one quote.
• Certified pieces sell for the most. If yours is flawless, having it graded by NGC or PCGS first can pay for itself.
• Verified numismatic shops. Use the Pesoteca shop directory to find dealers by city who will appraise it fairly.
• Collector marketplace. The Pesoteca buy-and-sell forum connects you directly with collectors who value the design, not just the metal.

Photograph the coin clearly (front, back, and edge) and note its exact weight. Do not dump it to the first buyer on social media. Because it is precious metal, only sell to someone who inspects it in person or through detailed photos.

Got one of these kilo coins sitting in a drawer? Post clear photos of both sides and the edge in the Pesoteca forum and let the community help you gauge its condition and real value.