100 Pesos Baja California Sur 2005: Silver Value Guide

If you inherited or found a large two-tone Mexican 100 pesos coin dated 2005 with "Baja California Sur" on it, here is the honest answer: the version you want is the one with a silver center. That one carries real precious metal and trades among collectors for a modest premium. The plain circulation version is worth close to face value.

In 2026, this coin sits in a very practical range. It is not a rare six-figure piece, but the silver core gives it a real floor, and complete-set collectors keep steady demand for it.

What this coin actually is

Mexico's central bank (Banco de México) issued a series honoring each of the 31 states plus the Federal District. This is the Baja California Sur entry, dated 2005. It is a bimetallic (two-metal) coin: a large 39 mm diameter, weighing 33.94 g, with a discontinuous reeded edge. The center and the outer ring are different metals, giving that two-tone contrast collectors like in this family.

Here is the part that matters for value. The series came in two releases:

• First release: brass-and-copper-nickel, the version you actually find in circulation or in old change jars. Low value.
• Second release (the cultural version): the center is struck in .999 fine silver. This is the collector coin, made in far smaller numbers.

The silver in the core is what sets a price floor. Even if the coin is worn, the silver has a melt value that keeps it above face value.

What it is worth in USD

Version	Metal (center)	Typical range (USD)	Notes
Circulation (first release)	Base metal	5 to 12 dollars	Sold as a novelty, not for silver
Silver cultural version, circulated	.999 silver core	15 to 30 dollars	Depends on silver spot price
Silver cultural version, in original case, uncirculated	.999 silver core	30 to 60 dollars	Best case, complete-set demand

These are collector-market ranges, not auction records. This coin does not set records. Anyone telling you a modern 2005 state coin is worth thousands is selling a myth. The value is driven by two things: the silver content and set-completion demand from collectors chasing all 32 designs.

Because silver moves with the market, the silver version's floor rises and falls with spot. If you want a quick sanity check, the silver center on the collector version is what carries the intrinsic value.

How to tell which version you have

This is the single most useful thing you can do. Look at the center of the coin:

• Silver-white, bright center that stays cool-toned, and a coin that came in a small presentation case, points to the collector silver version.
• Yellowish or plain gray center with no case, from pocket change, is almost always the base-metal circulation version.

Confirm it with a scale and calipers. The specs above (39 mm, 33.94 g) are exact. Fakes and misidentified coins usually miss on weight or diameter, or show flat, mushy relief.

The ones people think are worth a fortune (but aren't)

Large, heavy, two-tone Mexican coins look valuable, and social media posts push the idea that every one is worth thousands. For the 2005 state series, that is not true. These were made recently and in known quantities. The circulation version is worth a few dollars. The silver version is worth its silver plus a small collector premium. If you have the full set of all 32 in silver, in original cases, that complete set carries more weight than any single coin.

For context on Mexican coins that do command serious money, see our guide to the most valuable Mexican coins and how silver content sets a price floor.

Errors and varieties

Genuine mint errors (off-center strikes, die rotation, doubled strikes) can multiply the value if they are real and verifiable. Be careful: most "errors" circulating online are post-mint damage (scratches, hits, corrosion), not factory errors. If you think you have a true one, post clear photos in the Pesoteca forum and let the community check it.

Where to sell it

For a fair price, use a verified numismatic shop from the Pesoteca directory, which can appraise it on the spot, or the collector buy-and-sell forum. Photograph the obverse, reverse, and edge, and check the range in the table above before you sell. Skip dumping it to the first bidder on Facebook.

Working on the full state set, or trying to confirm your center is silver? Post a photo of your coin in the Pesoteca forum and we will help you place it.

The listing dedicated to Baja California Sur 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 gray whale (Eschrichtius robustus) off the peninsular coast, a species that migrates each winter from the Bering Sea to the lagoons of Ojo de Liebre and San Ignacio. The gray whale migration to Baja California Sur is one of the longest biological cycles documented in marine mammals, around 20,000 kilometers round trip. The breeding lagoons lie within the El Vizcaíno Biosphere Reserve, a UNESCO World Heritage Site since 1993.

State context: Baja California Sur went from Territory to a free state on October 8, 1974, along with Quintana Roo. Its capital, La Paz, faces the Sea of Cortez, an ecosystem Cousteau called the aquarium of the world.

In the Mexican numismatic market the Cultural phase circulated less than the Escudo 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 Escudo 2003 sister of Baja California Sur is part of the first phase of the series, with the state's official coat of arms on the reverse. Hunting down both pieces completes the set dedicated to Baja California Sur.