100 Pesos Aztec Calendar 2014: 1 Kilo of Pure Silver

If you inherited a massive silver coin the size of a saucer with an Aztec sun-stone on the back, you are holding one of Mexico's kilo silver pieces. The good news up front: the 2014 100 Pesos Aztec Calendar contains exactly 1,000 grams of .999 fine silver, so its value has a hard floor tied to the silver spot price. As of 2026, that floor alone puts most examples in the four-figure USD range, and a certified high grade adds a premium on top.

What you actually have

This is a bullion-and-collector coin issued by Banco de México (Banxico), the country's central bank. "100 pesos" is the face value stamped on it, but nobody trades it for 100 pesos. It trades for its silver, which is worth vastly more.

The key specs, all verifiable:

• Metal: .999 fine silver (99.9% pure)
• Weight: 1,000 grams (1 kilo, roughly 32.15 troy ounces)
• Diameter: 110 mm (about 4.3 inches)
• Edge: plain (smooth, no reeding)
• Year: 2014, single year of issue
• Reverse: the Aztec Calendar, also called the Piedra del Sol (Sun Stone), in a matte-and-mirror finish (Spanish: mate-brillo), meaning satin fields with polished, reflective raised details
• Obverse: the Mexican national coat of arms in the enlarged version used on large-format coins

The matte-and-mirror finish is what separates this issue from purely satin or full proof (mirror) versions of the same design. It gives the sun disc strong contrast and is part of why collectors chase it.

How much is it worth in USD

Start with the metal. One kilo is about 32.15 troy ounces of pure silver. Multiply the current silver spot price by 32.15 and you have the melt value, the absolute minimum this coin is worth on any given day. That number moves with the market, so check a live silver price the day you appraise it.

On top of melt, the collector premium depends almost entirely on condition:

Condition	What it means	Typical value over melt
Circulated / handled	Scratches, fingerprints, no capsule	Little to no premium; sells near melt
Uncirculated (UNC), original capsule	Clean, no wear, factory sealed	Modest premium above melt
Certified MS-65 or higher (NGC/PCGS)	Graded and slabbed by a top grading company	Strongest premium; commands the best prices at auction

Because the design is popular and the format is large and dramatic, a sealed, undamaged example draws real interest. But do not expect a "worth millions" story here. This is a modern coin. Its value comes from the kilo of silver plus a condition premium, not from historic rarity.

The mintage question (why nobody quotes an exact number)

Banxico has not published an official mintage figure for this specific kilo issue. That usually means it came out in restricted collector sets or in a very limited run. Collector forums float numbers, but none are confirmed. Treat any "only X ever made" claim as unverified until Banxico or a grading census backs it up. Limited it may be, but scarce enough to be rare is a different claim, and one no reliable source has proven.

The ones people overpay for

Most of the "error" coins that circulate online for this issue are not errors at all. They are post-mint damage: dings, corrosion, cleaning marks, and handling scratches. A genuine striking error (off-center strike, die rotation, doubled strike) can add real value, but genuine factory errors are rare and need expert verification. A scratch is not an error, and cleaning a silver coin to make it "shiny" almost always lowers its value.

How to tell if yours is genuine

With a kilo of silver on the line, verification matters.

1. Weigh and measure it. A real one is 1,000 grams and 110 mm across. Fakes almost always miss on weight or diameter. If your scale reads meaningfully off 1,000 g, be suspicious.
2. The ping test. Genuine silver rings with a high, sustained tone when tapped gently. A counterfeit made of base metal sounds dull and short.
3. Get it certified. For a coin worth four figures, submitting it to NGC or PCGS (the two leading US grading companies) is the definitive answer. They authenticate it, grade it, and seal it in a tamper-evident holder that buyers trust.

Never buy or sell one of these on photos alone. Insist on seeing weight, edge, and both faces.

Where to sell it

Because it is a precious-metal coin, you will always find a buyer, but not always a fair price. Your realistic options:

• A verified numismatic dealer. Fastest route; they appraise on the spot and pay near melt plus a fair premium. Browse the Pesoteca dealer directory to find one without middleman markup.
• Collector marketplaces and the Pesoteca buy-and-sell forum, where you deal directly with collectors who understand the design and may pay above melt for a clean, certified example.
• Precious-metals buyers, if you only care about the silver value and want a quick cash sale near spot.

Before you sell, photograph the coin (obverse, reverse, and edge), confirm the weight, and check the current silver price so you know your floor. Do not dump it to the first Facebook offer. If you think you may have a genuine mint error, post clear photos in the Pesoteca forum and let the community weigh in before you list it.

What condition is your kilo Aztec Calendar in, and do you still have the original capsule? Post your photos in the forum and we will help you pin down a realistic number.