1/20 oz Gold Libertad 2010 Proof: Value & Mintage

If you inherited or found a tiny gold Mexican coin marked "1/20 Onza" from 2010, you have one of the smallest and lowest-mintage pieces in the Gold Libertad series. Only 600 Proof examples were struck. That short run, not its age, is what drives collector demand in 2026.

What it's worth right now

This is a real gold coin, so it has a price floor set by its metal content. It contains 2.3 grams of gold at 0.999 fineness (about 0.074 troy ounces of pure gold). At current gold prices, the melt value alone is meaningful, and the coin never trades below that.

Above melt, the 2010 Proof commands a collector premium because of two things: the 600-piece mintage and the finish. A Proof coin in its original capsule, with clean mirror fields and no fingerprints, sells well above a handled example. Expect a range from melt value on a damaged piece up to a solid multiple of melt for a pristine, capsuled Proof, with the exact figure driven by grade and how many collectors are closing out a full gold set at that moment.

Because this is the smallest denomination, demand is split between people buying it loose and people who need it to complete the five-coin gold set (1/20, 1/10, 1/4, 1/2, and one ounce). That competition supports the price on the 1/20 more than you might expect for such a small coin.

What this coin actually is

The "Libertad" is the flagship bullion and collector series from Mexico's national mint, the Casa de Moneda de México. It is one of the few internationally recognized precious-metal programs that carries no face value; its worth comes entirely from its metal and its collectibility.

Key specs, unchanged and verifiable:

Attribute	Detail
Year	2010
Finish	Proof
Denomination	1/20 troy ounce gold
Metal	Gold, 0.999 fine
Weight	2.3 grams
Diameter	17.19 mm
Edge	Reeded
Proof mintage	600 pieces

The obverse shows the modern Winged Victory (the Ángel de la Independencia) standing over the two volcanoes. The reverse carries the national coat of arms in its wide composition, ringed by the historic coats of arms. The mirror-like Proof surface sharpens every detail and clearly separates this issue from the ordinary Brilliant Uncirculated version.

Proof vs Brilliant Uncirculated: why it matters

Mexico strikes the gold Libertad in two finishes. Brilliant Uncirculated (the standard bullion version) has higher mintages and trades close to metal value. The Proof is struck with polished dies for collectors, has a much smaller mintage, and carries a premium from day one. If your coin has deep mirrored fields and frosted design elements, and came in a sealed capsule, you likely have the Proof, which is the more valuable of the two.

The reality check

Do not expect a life-changing figure from a single 1/20 oz coin. It is small, and most of its value on a worn or cleaned example is simply the gold. The premium exists, and it is real for a clean Proof from a 600-coin run, but this is a coin worth verifying carefully rather than one you'll retire on. Its best value is realized inside a complete gold set or sold to a collector who specifically needs the 2010 Proof to close that slot.

How to check what yours is worth

1. Weigh and measure it. Use a jewelry scale and a caliper. It should weigh 2.3 grams and measure 17.19 mm. A piece that is off on either number is a red flag.
2. Confirm the finish. Mirror fields and frosted relief mean Proof. A satin, non-mirrored surface means the more common Brilliant Uncirculated version.
3. Grade the condition. Original capsule, no fingerprints on the mirrored fields, no scratches. Handling marks pull the price down fast on Proof coins.
4. Photograph obverse, reverse, and edge before you talk to any buyer.
5. Get a second opinion if you think it's genuine and high-grade, since certification from a recognized grader can raise what a buyer will pay.

Where to sell it

Sell to a verified numismatic shop from the Pesoteca shop directory, which can value and pay you on the spot, or list it in the Pesoteca buy-and-sell forum among collectors. Because this is a precious-metal coin, only deal with someone who lets you see the piece and confirm its weight, and verify before money changes hands. Skip dumping it to the first bidder on social media; you'll usually leave money on the table.

If you're building or completing a set, our guides on the gold Libertad series can help you understand how the fractions fit together.

Have a 2010 Proof 1/20 oz Libertad, or a fraction you can't identify? Post clear photos in the Pesoteca forum and let the community confirm the finish and grade before you buy or sell.

This piece is a 1/20 ounce gold Libertad struck in 2010 in a Proof finish. The series was born by DOF decree of April 8, 1981, and added the 1/2, 1/4, 1/10 and 1/20 fractions from 1991.

Felipe Calderon. Bicentennial of Independence. Spot closing at 1,405 dollars per ounce and FIX at 12.36 pesos.

Fraction: pure gold 1.555 grams at .999 fineness, total weight 1.73 grams, diameter 20 millimeters. The 1/20 is the smallest fraction and the gateway to physical gold. It began to be struck in 1991. Premium over spot of 15 to 25 percent, the highest in the family.

Proof: frosted mirror fields over matte relief, polished dies and multiple strikes. It comes encapsulated with an individual certificate. The Proof mintage is always a fraction of the regular one, typically +40 to 100 percent over bullion.

Banxico CM10 (consulted 2026-05-27) records 280 pieces against 1,236 pieces in the regular version of the same year. The differential explains the price premium between variants.

The Proof is hunted for the complete set of fractions and for the certificate with original capsule. When buying peer-to-peer, check the capsule for scratches, the certificate tied to the piece, and compare the premium against the regular of the same year before dealing with a middleman.