1/20 oz Silver Libertad 2010 Proof: Value & Where to Sell

If you inherited or found a tiny 2010 Mexican silver coin marked "1/20 Onza" with a mirror-like finish, here is the honest answer: it is a low-mintage proof worth more than its silver, but this is not a five-figure rarity. With only 10,000 struck, a genuine, well-preserved example typically trades in the tens to low hundreds of dollars depending on grade and whether it still has its original Banxico packaging.

What you actually have

This is a 1/20 oz Silver Libertad, part of Mexico's Onza Libertad series, which the country's mint (Casa de Moneda de México) has produced in bullion and proof formats since 1982. "Onza" is Spanish for "ounce," and "Libertad" (Liberty) refers to the Winged Victory (Ángel de la Independencia) on the design. The 1/20 oz is the smallest fractional size in the set.

Your coin has a proof finish: mirrored fields with frosted, satin-textured relief. Proofs are struck for collectors, not for circulation, using polished dies and specially prepared blanks. That finish is the first clue to value, and it is also the first thing to protect (fingerprints and cleaning ruin proofs fast).

Specifications (verify yours against these)

Spec	Detail
Denomination	1/20 Onza (fractional silver Libertad)
Year	2010
Finish	Proof
Weight	2.55 grams
Diameter	19.49 mm
Metal	Silver .999 fine
Edge	Reeded
Mintage	10,000 pieces
Era	Nuevos Pesos and current era

The actual silver content is 1/20 of a troy ounce of pure silver, so the melt (bullion) value is small in absolute terms, roughly the price of that fraction of an ounce of silver on any given day. That melt figure is your floor. Because this is a genuine proof with a mintage of only 10,000, the collector premium over melt is what matters.

What it's worth in 2026

Value is driven by three things: grade (condition), whether it still sits in the original Banxico blister/case with certificate, and the silver spot price at the moment of sale. For a coin this small and this recent, condition and packaging move the price far more than age.

• Loose, handled, or lightly impaired: modest premium over silver melt, often in the low tens of dollars.
• Clean proof, no fingerprints, near-perfect fields: noticeably higher, into the tens to low hundreds of dollars.
• Original Banxico packaging and certificate intact, or professionally graded high (NGC/PCGS PF69 to PF70): the top of the range, low hundreds of dollars, because collectors of the full fractional set will pay up for a matched, sealed piece.

We are not going to invent a single exact figure: for a coin whose value tracks silver spot, an honest range is more useful than a fake precise number. Check the grade ranges above against your coin and compare with recent sold listings before you buy or sell. See our Mexican coin grading guide to place your coin on the scale.

Don't fall for the "tiny old silver = fortune" myth

Small size and precious metal make people assume rarity. This coin is genuinely low mintage, but 10,000 is not the kind of number that produces auction records. If you see one advertised for thousands of dollars, that is optimism, not the market. The realistic ceiling for a common-year fractional proof like this is the low hundreds. What would push a specific piece higher is a verified, professionally graded PF70 or a legitimate mint error, and those are rare.

Mint errors: real ones vs. damage

Genuine striking errors (off-center strikes, die rotation, doubled dies) can multiply a coin's value if they are authentic and verifiable. But most "errors" people post online are post-mint damage: dings, scratches, corrosion, or the normal frosting of a proof mistaken for a flaw. If you think you have a real error, photograph it clearly and post it in the Pesoteca forum so the community can assess it before you assume it's worth more.

How to tell if yours is genuine

Counterfeits of silver coins do exist, and small proofs are copied. Do three quick checks:

1. Weigh it. A jewelry scale should read very close to 2.55 grams. Off weight is a red flag.
2. Measure the diameter. It should be 19.49 mm with calipers.
3. Inspect the finish. A real proof has crisp mirror fields and evenly frosted relief. Flat, dull, or blotchy detail suggests a fake or a heavily impaired coin.

Be suspicious of any offer priced well below the metal value, and of "silver" coins that feel too light or too magnetic (real silver is not magnetic).

Where to sell it safely

To sell the 2010 1/20 oz Silver Libertad Proof, your safest options are a verified numismatic dealer from the Pesoteca directory, who can value it on the spot, or the collector buy/sell forum where set builders actually want fractional pieces. Photograph the obverse, reverse, and edge, and confirm the grade range on this page before agreeing to a price. Avoid dumping it to the first bidder on social media, and for any precious-metal sale, deal only with someone who lets you verify weight and diameter before money changes hands.

Have a full fractional Libertad set, or unsure how to grade yours? Post your photos in the Pesoteca forum and let collectors weigh in before you sell.

1/20 troy oz Libertad silver 2010 Proof

This piece is the 1/20 troy oz silver Libertad, minted by the Mexican Mint in 2010 in its Proof version.

Technical data. It contains 1.55 g of pure silver, .999 fineness, and measures 16 mm in diameter. The reverse bears the effigy of the Angel of Independence, chosen 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 the family's mark of identity.

Role within the set. It is the smallest fraction of the set. It serves as an entry piece, a gift, or a first contact with the series: it costs little per example but carries the highest premium of the family over the value of the silver it contains, because the die cost is spread across fewer grams.

Context of the year. In 2010 Felipe Calderón Hinojosa was in office. A double national anniversary: the Bicentennial of the start of Independence and the Centennial of the start of the Mexican Revolution. Silver closed at 30.63 USD per troy ounce.

Proof finish. The Proof finish, also known as mirror, is achieved by polishing the dies to a specular shine in the fields, while the reliefs are frosted by micro-blasting. The piece leaves the press ready for display: it is not touched in the open air or handled without gloves. Banxico delivers it in a sealed plastic capsule with an individually numbered certificate of authenticity. The Proof mintage is always far lower than that of the same year's regular finish, and its price on the secondary market usually runs between 40% and 80% above the equivalent BU version.

Mintage. Banxico reported in its official tables a mintage of 3,396 pieces for this combination of fraction, year and finish. That number is the basis for gauging the piece's relative scarcity within the program.