100 Pesos Estado de México (Coat of Arms) 2003

Most people who find a big two-tone 100 pesos coin like this one assume it's worth a fortune. In most grades it isn't. The 2003 Estado de México 100 pesos is worth mainly for the real silver in its center, plus a modest collector premium. In 2026, an ordinary circulated example trades for a few dollars over its silver value, while a flawless uncirculated coin can bring more.

What you actually have

This is a bimetallic (two-metal) 100 pesos coin issued by the Bank of Mexico (Banxico) in 2003. It belongs to the first stage of a 32-coin series honoring each Mexican state, called "Unión de los Estados de la República Mexicana" (Union of the States of the Mexican Republic). The reverse shows the official coat of arms of the State of Mexico: an eagle flanked by cannons and castles.

Here is the part that matters for value: the center disc is genuine .925 Sterling silver. The outer ring is aluminum-bronze, which has little metal value. So this coin has a real silver floor, unlike ordinary pocket change.

Technical specs (check yours against these)

Spec	Detail
Denomination	100 pesos
Year	2003
Weight	33.78 grams
Diameter	39 mm
Center	.925 Sterling silver
Ring	Aluminum-bronze
Edge	Interrupted reeding
Obverse	Mexican national coat of arms
Series	Union of the States, first stage

The silver center weighs roughly 16 to 17 grams, which is where most of this coin's floor value comes from. The exact silver content is what tracks with the spot price of silver, not the whole 33.78 grams.

What it's worth in 2026

Be realistic. These were minted in decent numbers and are not rare in circulated condition. Value breaks down like this:

• Circulated (worn, handled): value is close to the silver in the center, typically a few dollars, plus a small premium.
• Uncirculated / brilliant: more, because collectors want clean examples for a complete 32-coin state set.
• Certified high grade (NGC/PCGS MS-67 or better): a genuine top-pop example can bring a real premium over a raw coin, but only if it's slab-certified.

The biggest driver of demand is set collectors trying to assemble all 32 states. A single coin is worth less than a coin that completes someone's collection.

The myth to kill

Because it's large, two-tone, and says "100 pesos," people assume it's worth around 100 dollars or more. It isn't. The 100 pesos is a face value in Mexican pesos, not US dollars, and the coin's real worth is its silver content plus a collector premium. Don't sell it as scrap, but don't expect a windfall either.

How to tell if yours is genuine

1. Weigh it. A jeweler's scale should read 33.78 grams. Fakes are usually off.
2. Measure it. 39 mm across with a caliper.
3. Check the two metals. The silver center should look distinctly whiter than the yellow ring, with a clean seam between them.
4. Inspect the relief. Sharp detail on the eagle and coat of arms. Flat, mushy strikes or blurred colors point to a counterfeit.

Errors and varieties

Genuine mint errors (off-center strikes, die rotation, double strikes) can multiply value if verified. Most "errors" people post online are post-mint damage: dings, corrosion, or wear, which add nothing. If you think you have a real one, get it looked at before you get excited.

The companion coin

In 2005, Banxico issued a second Estado de México 100 pesos as part of the series' second stage. Instead of the coat of arms, it shows a cultural icon of the state. You can see the 2005 Cultural version here. Collectors often want both to finish the State of Mexico pair.

Where to sell it

• A verified coin shop from the Pesoteca directory will appraise and buy it on the spot at a fair price.
• The Pesoteca buy-and-sell forum puts you in front of collectors who actually want the coin, often the best price for a nicer example.
• Photograph the obverse, reverse, and edge before selling, and compare against the specs above.

Avoid dumping it to the first bidder on social media. A silver coin sold as "just an old coin" always loses money.

Think you have a high-grade or error example of this coin? Post clear photos on the Pesoteca forum and let the community weigh in before you sell.

The 100-peso series Unión de los Estados de la República Mexicana began in 2003 with the first stage, called the Coat of Arms stage because the reverse carries the official heraldry of each of the 32 states. The piece dedicated to the State of Mexico is part of that first block of 32 coins, issued by Banxico under the framework of the Monetary System that has governed the modern peso since the Nuevos Pesos reform of 1993.

The State of Mexico has Toluca de Lerdo as its capital. It is one of the original states of the Federal Pact of 1824, signed on January 31 of that year. The reverse of the piece shows the official coat of arms of the state, with no allusion to specific historical episodes: the central motif is the heraldic emblem. For mintages and economic circulation data for each piece in the series, the sources are Banxico's official reports; until they are verified in the CM10 catalog, they are not reported in this listing.