1/10 oz Silver Libertad 1991: Value & How to Sell

If you inherited or found a small silver coin marked "1/10 Onza" with an angel and two volcanoes, you have a 1/10 oz Silver Libertad. In 2026, a common 1991 example in circulated condition trades close to its silver value, roughly 3 to 6 USD, while a certified high-grade piece can bring 40 to 100 USD or more. Here is what actually drives that spread.

What you actually have

The Onza Libertad is Mexico's official silver bullion coin, struck by the Casa de Moneda de México (the national mint). "Onza" is Spanish for ounce, and "Libertad" (Liberty) refers to the Winged Victory from the Angel of Independence monument in Mexico City, the figure on the coin's reverse. Behind her stand the twin volcanoes Popocatépetl and Iztaccíhuatl. The front (obverse) shows the Mexican national coat of arms, an eagle on a cactus with a serpent.

Your coin is the 1/10 ounce fraction, the smallest denomination the series carried. The exact specs, which matter for authentication:

• Metal: .999 fine silver (99.9 percent pure)
• Weight: 3.1 grams
• Diameter: 20.15 mm
• Edge: reeded (grooved)
• Year of issue: 1991, the first year the 1/10 oz fraction joined the series

The 1991 coin belongs to the 1982 to 1995 design that collectors nickname the "gordita" ("chubby") type: smaller in diameter and thicker than the modern version used since 1996. That older type is genuinely more sought after by Libertad collectors, which is why grade and type matter more here than the raw silver content.

How much is a 1991 1/10 oz Silver Libertad worth?

There are two ways to value this coin, and they give very different numbers.

By silver content (the floor). With 3.1 grams of .999 silver, this coin contains about 0.0997 troy ounce of silver, roughly one tenth of an ounce. Its bullion floor tracks the live silver spot price. No matter how worn it is, it will not sell below melt value for long, which puts a hard bottom of a few dollars under every example.

By collector demand (the premium). Because it is an early "gordita" fraction, a clean, uncirculated, or certified coin sells well above melt. Condition is everything: a coin someone carried in a pocket is worth its silver; a coin that sat untouched in a mint set is worth a real premium.

Coin	Year	Condition	Approx. value (USD)
1/10 oz Silver Libertad	1991	Circulated / worn	3 to 6
1/10 oz Silver Libertad	1991	Uncirculated (raw)	15 to 40
1/10 oz Silver Libertad	1991	Certified MS68-MS69 (NGC/PCGS)	50 to 120+

Ranges reflect typical dealer and collector transactions and move with the silver spot price and with demand for the early fraction sets. Exceptional certified examples of scarce early Libertad fractions can push higher when two serious collectors compete.

Is it rare?

Here is the honest answer most sellers won't give you. The Banco de México (Mexico's central bank) does not publish official year-by-year mintage figures for this era; public mintage records only begin in the year 2000. So no confirmed mintage exists for the 1991 1/10 oz. That is not proof of extreme rarity, and you should treat any "only X were made" claim online as speculation, not fact.

What is true: early Libertad fractions were struck in smaller numbers than the full 1 oz coin, and they were sold mostly in collector sets rather than for stacking. That makes clean, high-grade survivors legitimately scarcer than the common 1 oz coin. The value lives in the condition and the certification, not in a mythical mintage number.

How to tell if yours is genuine

Silver bullion gets counterfeited, so verify before you buy or sell.

1. Weigh it. A real one weighs 3.1 grams. Use a scale that reads to 0.01 g. Off by more than a couple hundredths, be suspicious.
2. Measure it. Diameter should be 20.15 mm. Fakes are often the wrong size or thickness.
3. Check the edge. It should be reeded (grooved), not smooth.
4. The ping test. Genuine .999 silver rings with a high, sustained tone when balanced on a fingertip and tapped gently; counterfeits sound dull and short.
5. Certify it. For any coin you think is high grade or valuable, submitting it to NGC or PCGS (the two major grading services) is the definitive check. They authenticate and seal it in a graded holder, which also raises its resale value.

Where to sell it

Because this is a precious-metal coin, sell only where the buyer can inspect the piece and confirm its weight in front of you.

• A verified numismatic dealer will value it on the spot and pay fairly for silver plus any collector premium.
• Collector-to-collector sale gets you closer to full retail if your coin is clean or certified.
• Photograph the obverse, reverse, and edge before you list anywhere. Serious buyers ask for edge and weight photos; casual online marketplaces are where most fakes circulate, so verify before money changes hands.

Don't dump a certified or uncirculated example for melt value. Check the grade first. The difference between "silver value" and "collector value" on this coin can be a factor of ten.

Have a 1991 1/10 oz Libertad you're not sure about? Post clear photos of the obverse, reverse, and edge in the Pesoteca forum and let collectors weigh in before you sell.

1/10 troy oz Libertad silver 1991 Regular BU

This piece is the 1/10 troy oz silver Libertad, minted by the Mexican Mint in 1991 in its Regular BU version.

Technical data. It contains 3.11 g of pure silver, .999 fineness, and measures 20 mm in diameter. The reverse bears the effigy of the Angel of Independence, adopted by Banxico as the official symbol of the series since 1981. The obverse shows the National Coat of Arms in its pre-1969 version, alongside other historical coats of arms as an identity mark of the family.

Role within the set. It's a small fraction but one that already has presence in the hand. It's used as a gift piece and as a gateway into serious collecting. The premium over spot remains higher than that of the full ounce, because the cost of the die is spread over so few grams.

Context of the year. In 1991 Carlos Salinas de Gortari was in office. The set's fractions were expanded: the 1/20, 1/10, 1/4 and 1/2 oz were added to the full ounce. This is the launch year of the fractional set in silver.

Regular BU finish. The Regular finish, catalogued by Banxico as satin or BU, is produced with dies that have no special polishing. The result is an even matte luster across the whole surface, with no mirror contrast between fields and reliefs. It's the traditional bullion finish: bought for its weight in pure silver plus a modest die premium. It's the version collectors look for to build the complete set by year without decapitalizing themselves on each piece.

Mintage. The exact mintage for this combination does not appear in the Bank of Mexico's public tables for 2000-2025. For pieces outside that range, the specific Mint catalog must be consulted.