10 Pesos Segundo Milenio (1999): Silver Value & Price
The 10 Pesos Segundo Milenio : Silver Value & Price is worth between $2,100 and $2,300 MXN depending on its grade of preservation.
Prices updated: August 2026
Second millennium, Mexico during the second millennium. Includes pedestal. Proof.
Second millennium, Mexico during the second millennium. Includes pedestal. Proof.
Design
Banxico
Reverse
Three structures representing the architectural evolution of Mexico over the millennium: the Mayan Observatory (El Caracol of Chichen Itza), the colonial aqueduct of Queretaro, and the 20th-century Central Library of the UNAM. A serpent frames two-thirds of the rim. Includes the legends "SEGUNDO MILENIO" and "Mo 10".
Obverse
Second millennium, Mexico during the second millennium. Includes a pedestal. Proof.
The 10 Pesos Segundo Milenio : Silver Value & Price is worth between $2,100 and $2,300 MXN depending on its grade of preservation.
Prices updated: August 2026
How much is the 10 Pesos Segundo Milenio (1999): Silver Value & Price worth?
The estimated value of the 10 Pesos Segundo Milenio (1999): Silver Value & Price ranges from $2,100 (circulated, XF) up to $2,300 (official blister pack), with $2,227 as a reference for an uncirculated (UNC) piece. The estimate is based on the official mintage and the historical behavior of the family.
The real price depends on four factors: the grade of preservation (a circulated piece is worth the low end of the range; an uncirculated one, or one still in its official blister pack, the high end), the finish (satin vs mirror/proof), the rarity within the series based on the mintage, and the metal spot price on the day of the deal when the piece is silver or gold. Check the value-by-grade table above and compare with equivalent pieces before buying or selling.
Where to buy or sell this coin?
Browse the national directory of numismatic shops or the community forum to trade directly with other collectors.
Description
The Mexican 10 Pesos Segundo Milenio dated 1999 is worth money mainly for one reason: it holds almost 2 troy ounces of pure silver. In 2026, that puts its floor around 55 to 70 USD in metal alone, and most sell close to that figure. This is a heavy silver commemorative, not a rare rarity that changes lives, but it is real silver with a real price.
What you actually have
This is a large silver coin the Bank of Mexico (Banxico) struck to mark the turn of the millennium. The series runs 1999 to 2000; yours is dated 1999. Cataloged as KM 633, it was made in proof finish, meaning mirror-like fields and a matte raised design, sold to collectors rather than spent as change.
Specifications, which matter for both value and authenticity:
- Weight: 62.2 grams
- Fineness: .999 silver (99.9% pure), about 62.1 g of pure silver
- Pure silver content: 1.998 troy ounces, essentially 2 oz
- Diameter: 48 mm
- Edge: reeded (grooved)
- Finish: proof
The reverse shows three buildings that sum up a thousand years of Mexican architecture: the Maya observatory known as El Caracol, the colonial aqueduct of Querétaro, and the 20th-century Central Library of the UNAM (Mexico's national university). A serpent frames two-thirds of the rim, with the legends "SEGUNDO MILENIO" (Second Millennium) and "Mo 10." The obverse carries the Mexican national coat of arms surrounded by historic emblems.
How much is the 1999 Segundo Milenio worth?
The price starts with the metal. Nearly 2 troy ounces of .999 silver gives this coin a hard floor tied to the silver spot price. In 2026, that melt value runs roughly 55 to 70 USD depending on where silver trades on the day.
Recorded collector sales sit close to that floor, generally in the 90 to 120 USD range, with a modest premium over pure metal. The premium climbs when the coin still has its original Banxico case and certificate of authenticity, and when the grade is high (proof coins with no hairlines or spotting).
| Item | Detail |
|---|---|
| Coin | 10 Pesos Segundo Milenio |
| Year | 1999 (series 1999 to 2000) |
| Metal | .999 silver, ~2 troy oz |
| Melt floor (2026) | ~55 to 70 USD |
| Typical sale price | ~90 to 120 USD |
| Where it sells | Coin dealers, collector secondary market |
Compare this to the Onza Libertad silver bullion line if you have several silver pieces to sort. The Segundo Milenio is a commemorative, so it can carry a small premium over plain bullion, but it is not a coin worth thousands.
Is it rare?
The verified mintage is 47,641 proof pieces. For a collector coin that is a low number, but it is not among the scarcest of its era. The coin surfaces on the secondary market with some regularity, so it is available if you want one and easy to sell if you have one. Rarity alone will not push it far above its silver value.
What people get wrong about it
Because it is large, silver, and marks the year 2000, some sellers list it as a windfall piece. It is not. Its value is anchored to silver content plus a small collector premium. If you see one advertised for several hundred dollars, that is a high asking price, not a market price. What you can count on is the melt floor: this coin will always be worth its silver.
How to tell if yours is genuine
Weight and dimensions are the fastest check. A real one weighs 62.2 grams and measures 48 mm across, with a reeded edge. Genuine .999 silver has a bright white tone, and a true proof shows mirror fields against a frosted raised design. If the weight comes up short or the diameter is off, be suspicious. Put it on a precision scale and compare against these numbers before you buy or sell.
Where to sell it
Sell it where buyers understand Banxico silver. Established coin dealers and the collector secondary market are your best bets. Because the value is close to melt, a reputable dealer will pay near the silver price plus a small premium; a bullion buyer may pay melt only. If it still has the case and certificate, keep them together, that is where the extra premium lives. To find dealers who handle Mexican silver, check the Pesoteca shop directory.
Have a Segundo Milenio still sealed in its original Banxico case? Post the certificate number and a photo in the Pesoteca forum and we will tell you where it sits against current sales.
Value range of this piece
Market estimate: $2,100 - $2,300 MXN depending on the grade of preservation (typical range between a circulated and an uncirculated piece).
Frequently asked questions
How much is the 1999 10 Pesos Segundo Milenio worth?
Its floor is the silver: it holds nearly 2 troy ounces of .999 silver, worth about 55 to 70 USD in metal at {{AÑO}} spot prices. Recorded collector sales run roughly 90 to 120 USD, close to intrinsic value with a small premium for grade and for having the original case and certificate.
Is the Segundo Milenio coin rare?
The verified mintage is 47,641 proof pieces. That is low for a coin overall but not among the scarcest of its era. It appears on the collector secondary market with some regularity, so it is neither hard to find nor hard to sell.
How can I tell if my coin is genuine?
Check weight and size. A real one weighs 62.2 grams and measures 48 mm across, with a reeded edge. Genuine .999 silver is bright white, and a true proof shows mirror fields with a frosted raised design. If the weight is short or the diameter is wrong, be suspicious. Weigh it on a precision scale and compare to these figures.
Where can I sell it?
Sell to established coin dealers or on the collector secondary market where buyers know Banxico silver. Since value is close to melt, expect the silver price plus a small premium. Keep the original case and certificate together for the best offer. Find dealers who handle Mexican silver in the Pesoteca directory at /tiendas.
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Sources
Images for informational and educational purposes, attributed to their original source. Reference values; the real price depends on the grade, the specific variant and demand.
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