100 Pesos Yucatán Silver Coin (2003): Value & What to Know

If you inherited a large bimetallic Mexican 100 pesos coin with a state seal in the center, here is the honest answer: the common circulating version is worth a few dollars, but the second-phase coin has a genuine silver core that gives it a real floor value, and clean uncirculated examples of the Yucatán 100 pesos trade for roughly 25 to 45 USD in 2026, depending on grade and whether it is the silver type.

This is not a coin worth thousands. It is a modern collector coin from a well-documented Mexican series. But the silver content means it will never be worthless, and that is what separates it from most "old Mexican coins" people find in a drawer.

What you actually have

The 100 Pesos Yucatán is part of the Estados series ("States" series), a program from Banco de México (Banxico, the central bank) that dedicated one 100-peso coin to each of Mexico's 32 states, each showing that state's coat of arms. The Yucatán coin shows the state seal with a deer and palm trees on the reverse.

The series was struck in two phases, and which one you have decides the value:

• First phase (circulating): the center is a base-metal alloy, not silver. These were meant for everyday use. Worth a few dollars at most.
• Second phase (collector): the center is .925 sterling silver. This is the one collectors want, both for the metal and the lower mintage.

Specifications (2003 issue)

Spec	Detail
Denomination	100 Pesos
Year	2003
Type	Bimetallic (aluminum-bronze ring, silver center on 2nd phase)
Silver fineness (2nd phase)	.925 sterling
Weight	33.78 grams
Diameter	39 mm
Edge	Interrupted reeded
Mint	Casa de Moneda de México (Mexican Mint)
Reverse	Coat of arms of the State of Yucatán

How to tell which one you have (and its value)

The fastest check is the center color and a scale. The silver center has a brighter, whiter tone against the golden ring, while the base-metal circulating version looks more uniform. If you want certainty, weigh it: the coin should hit 33.78 grams. A digital jewelry scale and a caliper settle most questions in under a minute.

Value by condition on the silver (2nd phase) type:

• Circulated: roughly 15 to 25 USD, close to the silver melt value plus a small collector premium.
• BU (Brilliant Uncirculated, never spent, no scratches on the silver center): roughly 30 to 45 USD.
• Certified high grade (graded by a service like NGC or PCGS): can push higher for top examples, but this is a series coin, not a rarity, so do not expect a windfall.

The silver center gives every second-phase coin a hard floor at its melt value, which is why even a worn one still sells. That is the practical takeaway if you found one in an estate.

Don't expect a fortune

Social media posts that claim modern Mexican bimetallic coins are "worth thousands" are almost always wrong. The Yucatán 100 pesos is a collectible with a modest, stable value driven by its silver content and by collectors trying to complete the 32-state set. It is a solid entry point into modern Mexican bimetallic coins, not a jackpot.

The exception is a genuine, verifiable mint error (off-center strike, die rotation, double strike). Real errors can multiply the value. Most "errors" people post online are post-mint damage: dings, corrosion, or wear, not factory mistakes. If you think you have one, get a second opinion before assuming it is valuable.

Where to sell or appraise it

• A verified numismatic dealer from the Pesoteca shop directory can appraise it on the spot and pay fair value without the markup of a middleman.
• The Pesoteca buy-and-sell forum connects you directly with collectors building the state set, often the best price for a clean example.
• For error checks or authentication questions, post clear photos of the front, back, and edge in the Pesoteca forum so the community can review it.

Photograph the obverse, reverse, and edge in good light, note the exact weight, and compare against the price range above before you sell. Avoid dumping it on a marketplace to the first lowball offer.

If you want to collect the full run, browse related modern Mexican coin values and see how the rest of the state series stacks up. Which state's coin did you find in the box?

The 100-peso Union of the States of the Mexican Republic series 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 Yucatan is part of that first block of 32 coins, issued by Banxico under the framework of the Monetary System governing the modern peso since the nuevos pesos reform of 1993.

Yucatan has Merida 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 state's official coat of arms, without allusions to specific historical episodes: the central motif is the heraldic emblem. For mintages and circulation economic data of each piece in the series, the sources are Banxico's official reports; while they are not verified in the CM10 catalog they are not reported in this listing.