100 Pesos Quintana Roo 2003 (Coat of Arms): Value & Silver Content

If you inherited a large, heavy Mexican coin marked "100 Pesos" with a state coat of arms on it, here is the honest answer: it has a genuine silver center, so it will never be worth less than its melt value, and most examples trade for roughly 20 to 35 USD in 2026. It is not a rare fortune-maker, but it is not pocket change either.

The 2003 Quintana Roo 100 Pesos is part of a well-known Mexican series that put all 32 states on collectible bimetallic coins. This one shows the coat of arms of the state of Quintana Roo (the Caribbean state where Cancún and Tulum are) on the reverse, and the Mexican national coat of arms (an eagle on a cactus with a snake) on the obverse. It was struck by the Casa de Moneda de México, the Mexican Mint.

What it's worth in 2026

This coin sits between two values: its silver content and its collector demand. The center disc is real silver, which gives the coin a price floor that moves with the silver market. On top of that, collectors who are assembling the full 32-state set pay a premium for clean, undamaged examples.

Grade / condition	Typical value (USD)
Circulated, scratched or spotted	18 to 25
Clean uncirculated, original luster	28 to 40
Certified high grade (MS66 or better)	45 to 90+

These are ranges, not guarantees. The single biggest factor is the state of the silver center and the outer ring. Spots, fingerprints, or dings on the ring pull the price down fast. A crisp, spot-free example with full mint luster is where the real money is, because those are genuinely hard to find. Many of these coins were handled, cleaned, or stored badly, so a fresh one stands out.

The specs (keep these for verification)

These numbers matter because fakes almost always get the weight or diameter wrong. Check yours against a jewelry scale and a caliper.

• Composition: bimetallic, silver center with a base-metal outer ring
• Total weight: 33.78 grams
• Diameter: 39 millimeters
• Edge: interrupted reeding (grooved sections with smooth gaps)
• Year: 2003
• Reverse: coat of arms of Quintana Roo
• Obverse: Mexican national coat of arms

What this series actually is

The Quintana Roo piece belongs to the second phase of Mexico's commemorative state series, the phase built around each state's coat of arms. Mexican collectors like this set because it covers all 32 states in one uniform format, and because these coins have real weight and a silver core rather than being cheap tokens. For anyone building the set, Quintana Roo is simply one of the 32 pieces you need to complete it, which keeps steady demand for clean examples.

The myth to ignore

Because it says "100 Pesos" and looks impressive, people assume it is worth hundreds or thousands of dollars. It is not. The face value is symbolic, and 100 pesos in Mexican currency is only a few US dollars anyway. The coin's worth comes from its silver and from collector demand, nothing more. If someone online tells you a common-date 2003 Quintana Roo 100 Pesos is worth thousands, that is clickbait, not a real auction result.

Mint errors are the one exception. Genuine, verifiable errors (off-center strikes, die rotation, double strikes) can multiply the value. But most "errors" people post online are post-mint damage: hits, corrosion, or cleaning marks. Those add nothing.

How to check what yours is worth

1. Weigh and measure it. Confirm 33.78 grams and 39 millimeters. Wrong numbers usually mean a fake or a damaged piece.
2. Grade it honestly. Look at the silver center under good light. Spots, scratches, and worn detail lower the price. Do not clean it; cleaning destroys value.
3. Photograph obverse, reverse, and edge in sharp, well-lit shots.
4. Compare against the range above before you accept any offer.

Where to sell it

The safest options are a verified numismatic shop from the Pesoteca dealer directory, where you can get an in-person appraisal, or the Pesoteca buy-and-sell forum among collectors. Avoid dumping it on social media to the first buyer who messages you. If you think you have a mint error or a top-grade example, post clear photos in the Pesoteca forum so the community can weigh in.

Have a full or partial set of these state coins? Which states are you still missing? Start a thread in the forum and let collectors help you finish it.

The 100 pesos series Union of the States of the Mexican Republic began in 2003 with the first stage, called the Coat of Arms stage because the reverse bears the official arms of each of the 32 states. The piece dedicated to Quintana Roo 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.

Quintana Roo has Chetumal as its capital. It was established as a free and sovereign state in 1974. The reverse of the piece shows the official coat of arms of the state, without allusions to specific historical episodes: the central motif is the heraldic emblem. For mintages and economic circulation data of 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.