100 Pesos Silver 2005: Mint of Mexico 470th Anniversary

If you inherited or found a large silver Mexican coin marked "100 Pesos" dated 2005 with mint imagery, here is the honest answer: it is a genuine .999 pure silver commemorative worth roughly its silver content plus a modest premium. In 2026, a circulated example trades in the range of 30 to 45 dollars, while certified uncirculated pieces can reach higher.

This coin is not a rare six-figure piece, and any site telling you a modern 100 Pesos is "worth a fortune" is selling you clickbait. What you actually have is close to a full ounce of investment-grade silver with a commemorative design, and its value tracks the silver market first and collector demand second.

What this coin actually is

The 2005 100 Pesos was struck in pure silver, .999 fineness, to mark the 470th anniversary of the Casa de Moneda de México (the Mint of Mexico). "Casa de Moneda" simply means the national mint. Founded in 1535, it is the oldest mint in the Americas, and this coin is a tribute to that history.

Specifications you can verify against your own coin:

• Weight: 33.967 grams (very close to one full troy ounce of silver at 31.1 grams, plus the metal that makes it a coin)
• Diameter: 39 mm
• Fineness: .999 pure silver
• Edge: interrupted reeded edge
• Denomination: 100 Pesos
• Year: 2005 (single year of issue)

This was never pocket change. It was made for collectors and for buyers who want silver with a meaningful commemorative reason behind it. It belongs to the family of Mexican silver commemoratives that Banxico (the Bank of Mexico) and the mint have produced since the 1990s.

What it is worth in 2026

Value rests on two things: silver content and condition. The coin holds close to an ounce of .999 silver, which sets a hard floor. When silver rises, this coin rises with it. That bullion floor is why a beat-up example still has real value, unlike most base-metal coins.

These ranges move with the silver spot price. A clean, mark-free example (collectors call this BU, or Brilliant Uncirculated) always sells above a handled one. A piece formally graded by NGC or PCGS can carry a further premium because the grade and authenticity are then guaranteed by a third party.

The mintage question

The exact mintage of this issue is not officially documented by Banxico. That usually means it was released in restricted numismatic sets or as a limited, one-time commemorative rather than a mass circulation strike. Collector forums float various numbers, but none are confirmed. Low or undocumented mintage helps the collector premium, but it does not turn a modern silver ounce into a rare classic. Treat any specific mintage figure you see online as speculation.

How to tell if yours is genuine

Because it is precious metal, fakes exist. Three quick checks:

1. Weigh it. A genuine coin weighs 33.967 grams. If yours is off by more than a fraction, be suspicious.
2. Measure it. It should be 39 mm across.
3. Compare the relief. Counterfeits tend to have flatter, softer detail. Compare against official Banxico images.

For a coin worth over 100 dollars, certified grading from NGC or PCGS is the definitive safeguard. They authenticate and grade in one step, and a slabbed coin sells faster and for more.

Where to sell it

Your realistic options:

• Verified coin dealers, who will appraise and often buy on the spot. This is the safest route for a silver coin.
• Serious collector marketplaces and forums, where you deal with people who know the coin.
• Precious metal buyers, who will at least pay the silver melt value as a floor.

Whatever route you pick, photograph the coin front, back, and edge, and confirm weight before any deal. For a piece in this value range, a dealer's small appraisal fee is worth it. If you want to check current asking prices before you sell, the Pesoteca buy-and-sell forum and the verified dealer directory let you compare against real collector demand.

If you think you have a mint error (off-center strike, die rotation, doubling), post clear photos in the Pesoteca forum before assuming it adds value. Most "errors" circulating online are post-mint damage, not factory errors, and only genuine, verifiable errors change the price.

Have a 2005 100 Pesos silver coin sitting in a drawer? Post its weight and photos in the forum and let collectors tell you what it would actually bring today.

The Mexican Mint was founded on May 11, 1535, by order of Viceroy Antonio de Mendoza, which makes it the oldest coin-striking institution in the American continent. In 2005 it turned 470 years old. This piece commemorates that milestone. Banxico's quarterly SM report marks 0 pieces in circulation because it was an edition exclusively for collectors in a commemorative folder.