100 Pesos Sonora (2007): Silver Bimetallic Coin Value

If you inherited a large, heavy Mexican coin marked "100 Pesos" and "Sonora," here is the honest answer: most of its value comes from the real silver in its center, not from age or rarity. In circulated condition it trades for roughly 8 to 30 USD. In certified uncirculated grades it can climb higher, but this is not a rare coin, and no version of it is worth thousands.

What you actually have

The 100 Pesos Sonora is a bimetallic coin issued in 2007 as part of a large series honoring each Mexican state plus Mexico City. "Bimetallic" means two metals: an outer ring of common metal and a distinct center core.

Here is the key detail for value. Two versions of this coin exist:

• Circulating version: the center is a common alloy. Face value only, worth around 5 to 6 USD (its 100-peso face value).
• Numismatic (silver) version: the center is .999 fine silver, made for collectors. This is the one with real intrinsic value.

Both share the same specs: 34.07 grams total weight, 39.08 mm diameter, with a discontinuous reeded edge. The reverse shows imagery representing the state of Sonora; the obverse carries the Mexican national coat of arms, which unifies the whole series.

Is it silver? How much is that worth

Yes, the collector version has a genuine .999 silver core. That silver content sets a price floor: even a worn coin cannot drop below its melt value.

The catch: the silver is only in the center core, not the whole coin. This is not a full ounce of silver like an Onza Libertad (Mexico's one-ounce silver bullion coin). The silver content of the Sonora core is roughly a third of a troy ounce, which is why melt value lands in the single-digit to low double-digit USD range rather than a full silver ounce price.

If you cannot tell which version you have, the safest test is weight and a certified appraisal. The silver version is often distinguishable by the slightly different color and luster of the center compared to the common-metal circulating piece.

Real value ranges

Coin	Year	Condition	Approx. value (USD)
100 Pesos Sonora (circulating)	2007	Circulated	5 to 6 (face value)
100 Pesos Sonora (silver core)	2007	Circulated	8 to 30
100 Pesos Sonora (silver core)	2007	Uncirculated / MS	30 to 80
100 Pesos Sonora (silver core, certified)	2007	MS-65+ NGC/PCGS	Higher, but still not rare

These are working ranges based on the silver content and grade, not fixed prices. The number swings with the spot price of silver and the condition of your specific coin.

The myth: "it must be worth a fortune, it's huge and old"

Size and heft fool people. This coin is large and impressive, and it carries a 100-peso face value, so many owners assume it is worth hundreds or thousands of dollars. It is not. It was issued in 2007, which is recent, and it was made in quantity for collectors and circulation.

The mintage of the silver numismatic version is not officially published by Banxico, but scarcity here does not translate into big money because collector demand for this series is steady, not frantic. If someone tells you your Sonora 100 Pesos is worth thousands in ordinary condition, they are wrong.

Where the real value lives

What actually moves the price:

1. The silver core (only the numismatic version has it). This is the floor.
2. Condition. Original mint luster with no handling marks matters. A coin still bright and unscratched sells for a real premium over a worn one.
3. Certification. A grade from NGC or PCGS (the two major US grading services) removes doubt about authenticity and condition, which is worth paying for on the better pieces.
4. Series demand. Collectors assembling the complete state series need every piece, and Sonora is one of them. That steady demand supports the price.

How to tell if yours is genuine

• Weigh it. It should be 34.07 grams. Off weight is a red flag.
• Measure it. Diameter should be 39.08 mm.
• Check the relief. Counterfeits tend to have flatter, softer detail. Compare against official Banxico images.
• For anything valuable, get it graded. NGC or PCGS certification is the definitive insurance against fakes.

Where to sell it

For a coin in this value range, keep it simple and safe:

• A verified numismatic shop in the Pesoteca directory will appraise it on the spot at fair value.
• The Pesoteca buy-and-sell forum connects you directly with collectors of this series.
• Photograph the obverse, reverse, and edge before you list. Buyers of silver coins always want to see the edge.

Avoid dumping it to the first Facebook offer, and be cautious on open marketplaces where counterfeits circulate. Always confirm weight and edge photos on any coin you buy.

Not sure whether your Sonora coin is the silver version or the common one? Post clear photos of both sides and the center core in the Pesoteca forum and the community will tell you which one you have.

The entry dedicated to Sonora came out in 2007 as part of the third and final wave of the Cultural phase, together with Tabasco and Tamaulipas. Banxico called this second stage Motivos Emblemáticos and replaced the state coat of arms with a specific cultural symbol.

The reverse of the piece shows the Yaqui dancer of the Deer Dance with natural antlers on the forehead and butterfly-cocoon rattles at the ankles. The Deer Dance or Maaso yiihua is a Yoeme-Yaqui ritual that represents the sacred hunt of the mule deer, a totemic animal that represents the natural world or Huya Ania. The dancer enacts the death of the deer before the pascola hunters, accompanied by the Yaqui harp and the gourd rasp tenaboim. It is Intangible Cultural Heritage of the Nation recognized by the INAH.

State context: Sonora was established as a state on October 13, 1830, when it separated from Sinaloa. Its capital Hermosillo was founded in 1700 as Villa del Pitic. The Sonoran Yaquis and Mayos preserve their eight historic towns with traditional self-government recognized in the Mexican Constitution. It is the second largest entity in the country after Chihuahua.

In the Mexican numismatic market the Cultural phase circulated less than the Escudo 2003 and today is usually found in higher grades because it reached the streets late. Banxico's official mintages for this piece are not always published in the Economic Information System, but the figure reported for circulation tends to hover around 250,000 pieces per state in the Cultural phase. Always confirm against the catalog of the complete 100 pesos Estados series before closing a large purchase.

The sister Escudo 2003 of Sonora is part of the first phase of the series, with the official coat of arms of the state on the reverse. Pursuing both pieces completes the set dedicated to Sonora.