100 Pesos Aguascalientes (2005): Value & Silver Content

If you inherited a 2005 Mexican 100 pesos coin from Aguascalientes, here is the honest answer: most of its value comes from the silver in the center, not from the 100 pesos stamped on the face and not from being a commemorative. In 2026, this piece typically trades for its silver melt value plus a modest collector premium, usually a few dollars to low double digits above the silver, depending on condition.

This is a bimetallic coin. The center is .925 sterling silver, set inside a ring of aluminum bronze (the gold-colored outer part). Only the center is silver. Total weight is 33.94 grams and the diameter is 39 mm, with a discontinuous reeded edge. Catalog reference is KM# 721, struck at the Mexican mint (mint mark Mo).

What it actually is

This coin is the last release in a commemorative series Mexico's central bank (Banco de México) issued to mark the 180th anniversary of the Federation. The series honored all 32 Mexican states, released in reverse alphabetical order from Zacatecas down to Aguascalientes. Because Aguascalientes comes last alphabetically, this 2005 piece closes the collection.

The commemorative face carries the Coat of Arms of the State of Aguascalientes at center, with the legend ESTADO DE AGUASCALIENTES, the year 2005, and the value 100 pesos. The other side shows the National Coat of Arms (the eagle on a cactus) with the legend ESTADOS UNIDOS MEXICANOS, the shared design across the entire state 100 pesos series.

Is it rare?

Not in the sense most people hope. The first edition had a mintage of 248,410 pieces, a figure you can verify in the standard catalog (KM# 721). That is a healthy print run, so scarcity alone will not make it valuable. What gives this coin a hard price floor is the silver center. The .925 silver tracks the daily spot price, and collectors of the complete state set add a small premium on top.

What drives the value

Factor	Detail
Coin	100 Pesos Aguascalientes (state series)
Year	2005
Catalog	KM# 721
Mintage (1st edition)	248,410
Metal	.925 silver center, aluminum bronze ring
Total weight	33.94 g (only the center is silver)
Diameter	39 mm
Typical value	Silver melt of the center plus a small collector premium

The number to remember: value comes from the silver center, not from the full 33.94 grams. The aluminum bronze ring is not silver and carries no bullion value. To estimate what yours is worth, calculate on the weight of the silver center, then check the day's silver spot price and add a modest premium for the commemorative and for condition.

The myth to kill

A face value of 100 pesos does not mean this coin is worth 100 pesos, and it certainly does not make it a fortune. Commemorative status alone does not create high value when the mintage runs into the hundreds of thousands. Treat this as a silver piece with a collector bonus, not a rarity. A clean, uncirculated example in an original mint holder will bring more than a worn loose coin, but the ceiling here is measured in dollars over silver, not in hundreds.

How to check what yours is worth

• Confirm the specs. Weight should be 33.94 g, diameter 39 mm, with a discontinuous reeded edge. The center should read as silver, the ring as aluminum bronze.
• Check the design. The commemorative side shows the Aguascalientes state coat of arms with the legend ESTADO DE AGUASCALIENTES. If that face is wrong or missing, you do not have this coin.
• Price the silver first. Work out the value of the silver center against the current spot price. That is your floor.
• Grade matters at the margin. An original, untouched example carries a better premium than a handled one.

Where to sell or buy

This coin moves between two kinds of buyers: collectors completing the 32-state set, and buyers who want it for the silver content. To get a fair price either way, compare offers in the Pesoteca store directory against the day's silver value before you close any deal. A reputable dealer can also verify authenticity on the spot.

Have one of these, or the full state set from your inheritance? Post the details in the Pesoteca forum and we will help you work out what it is worth today.

The piece dedicated to Aguascalientes belongs to the first wave of the Cultural phase, issued in 2005 along with most of the set. Banxico called this second stage Emblematic Motifs and replaced the state coat of arms with a specific cultural symbol.

The reverse of the piece shows the Temple of San Antonio, the work of self-taught architect Refugio Reyes Rivas, completed in 1908, with its bulbous, Byzantine-inspired dome. The Temple of San Antonio is the most recognized architectural piece in the historic center of Aguascalientes. Reyes Rivas blended neoclassical, oriental, and Mudejar elements without holding a formal architecture degree, and that hybridism made it the most photographed building in the city.

State context: Aguascalientes was established as a free and sovereign state on December 27, 1857. Its namesake capital grew up around the hot springs that give it its name, and since the 19th century it has hosted the San Marcos National Fair.

In the Mexican numismatic market the Cultural phase circulated less than the Coat of Arms 2003 phase 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 States series before closing a large purchase.

The Coat of Arms 2003 sibling of Aguascalientes is part of the first phase of the series, with the state's official coat of arms on the reverse. Chasing both pieces completes the set dedicated to Aguascalientes.