Mexican 100 Pesos 2005 (State Series): Value & How to Sell

If you inherited or found a Mexican 100 Pesos 2005 coin, here is the honest answer first: on its own, in circulated condition, it is worth only a few dollars. This is a modern bimetallic circulation coin, not a rare bullion piece. The real money in this series comes from complete sets in high grade, not single coins pulled from a drawer.

What you actually have

The 100 Pesos 2005 is a bimetallic coin: a center core of one metal set inside an outer ring of another, exactly like a US quarter is not, but similar in construction to the euro coins many people recognize. It weighs 3.99 grams, measures 21 mm across, and has an interrupted reeded edge (grooves that come in sections rather than running all the way around).

It belongs to Mexico's State Series (in Spanish, the coins honoring the estados de la República, meaning the states that make up the country). This was one of the most ambitious coin programs the Bank of Mexico (Banxico) ever ran. The concept mirrors the US State Quarters program: each coin carries the coat of arms of a different Mexican state, and the point was to collect all of them. New pieces came out year after year, and 2005 belongs to the first releases in that long family.

Is it rare? Honest answer

No. A single 100 Pesos 2005 coin is easy to find. These circulated as legal tender, so worn examples turn up constantly. What is genuinely hard, and where collector demand actually sits, is assembling the entire State Series in matching high grade. A complete UNC set is a real collecting achievement. One loose coin from your change is not.

Banxico never published a firm mintage figure for this specific issue. That absence usually points to a limited or targeted release, often tied to numismatic sets rather than a huge circulation run. You will see collectors on forums guessing at numbers, but none of those figures are confirmed, so treat them with skepticism.

What it is worth in USD

Condition drives everything here. There is no silver or gold content to set a bullion floor, so this coin lives and dies on grade and demand.

Coin	Year	Condition	Approximate value (USD)
100 Pesos (bimetallic, State Series)	2005	Circulated	A few dollars over face
100 Pesos (bimetallic, State Series)	2005	Uncirculated (UNC), raw	Modest premium
100 Pesos (bimetallic, State Series)	2005	Certified high grade (NGC/PCGS)	Highest, set by demand

A circulated piece is worth a small premium above its face value as a novelty. An uncirculated example, one that never entered circulation and keeps the sharp contrast between the outer ring and the inner core, carries a real but modest premium. The top prices go to coins graded and encapsulated by NGC or PCGS (the two major US grading services), because a certified grade is the only proof of condition a serious buyer will trust.

Do not expect a life-changing figure from this coin. Anyone telling you a common modern circulation piece is worth thousands is selling a myth.

What actually adds value

• Grade. An UNC coin with full luster beats a worn one many times over. Circulated pieces lose shine and the crisp edges of the reeding.
• Certification. A raw "I think it's mint state" coin is worth less than the same coin in an NGC or PCGS holder. If you plan to sell your best example, grading is the deciding factor.
• Genuine mint errors. Off-center strikes, die rotation, and double strikes can multiply value if they are real and verifiable. The catch: most "errors" people post online are post-mint damage (dings, corrosion, scratches), not factory errors. Those add nothing.

How to tell if yours is genuine

Start with the physical specs. A real 100 Pesos 2005 weighs 3.99 grams and measures 21 mm. If your coin misses those numbers, you already have your answer. Next, compare the relief (the raised detail) against official Banxico images. Counterfeits tend to look flat and mushy where the genuine coin is sharp. For any piece you believe is valuable, NGC or PCGS certification is the definitive check, since they authenticate before they grade.

Where to sell it

For a common circulated example, the effort of formal selling rarely pays off. For a high-grade or certified piece, your best options are:

• A verified coin dealer who can value it on the spot. Browse the Pesoteca dealer directory to find one.
• The Pesoteca buy-and-sell forum, where you deal directly with collectors who actually want the State Series.
• Established coin shows, where multiple buyers compete.

Before selling, photograph the coin front, back, and edge, and check the grade honestly. Avoid dumping it on a general marketplace at the first offer, and if you buy from an online listing, always ask the seller for edge photos and the exact weight, since that is where fakes get exposed.

Starting a State Series collection or think you found a mint error? Post clear photos in the Pesoteca forum and let the community help you confirm what you have.