20 Pesos Gold Coin (1870): Value & Real Prices

If you inherited an 1870 Mexican 20 Pesos gold coin, here is the honest answer: it is worth real money, and most of that value comes from its gold. This coin holds roughly 1.867 troy ounces of pure gold, which sets a floor of several thousand US dollars regardless of condition. In 2026, that alone puts it far ahead of the typical old Mexican coin worth a few dollars.

What you actually have

The 20 Pesos oro dated 1870 ("oro" is Spanish for gold) was the highest denomination in Mexico's monetary system at the time. It was minted for stored wealth and large transactions, not everyday spending, which is why fewer survive than the smaller silver coins.

Hard specs, exactly as recorded:

• Weight: 33.73 grams
• Diameter: 30 mm
• Edge: reeded (grooved)
• Composition: gold, .875 fineness (21 karat), which means about 29.52 grams (1.867 troy ounces) of pure gold

That gold content is the key number. At current gold prices, the metal alone is worth well over 3,500 USD. No 1870 20 Pesos in genuine gold sells below its melt value.

How much is the 1870 20 Pesos worth?

Value comes from two layers: the gold underneath, and the collector premium on top. For a common date in average circulated condition, you are close to melt value. For sharp, high-grade examples with full relief and an intact reeded edge, prices climb well above the metal.

These are ranges, not guarantees. The exact figure depends on the mint mark, the survival rate for that specific year and mint, and third-party grading. A certified MS example from a scarce mint can exceed the top of this range.

Why grade decides everything

Two 1870 20 Pesos with the same gold content can sell for a 3,000 USD difference based only on condition. Grade measures wear, strike sharpness, and surface preservation. Collectors pay steep premiums for coins that never circulated, because so few high-grade survivors exist for the older Republic gold. If your coin has crisp relief and a fully defined reeded edge, it is worth getting it professionally graded before you sell.

The gold floor: why this coin can't be "worthless"

Unlike most old Mexican coins, this one has a built-in safety net. Even a worn, damaged 1870 20 Pesos is still nearly two ounces of gold. That melt value moves with the gold market, so the coin's minimum value rises when gold rises. This is the same principle behind modern Mexican bullion coins like the Centenario and the Onza Libertad, which trade close to their metal content.

How to check if yours is genuine

Gold fakes exist, and this denomination is a target. Two quick checks catch most of them:

1. Weigh it. A jeweler's scale should read very close to 33.73 grams. Fakes are almost always off, usually light.
2. Measure the diameter. It should be 30 mm on a caliper.

Genuine gold has a specific density, so a coin that hits both the correct weight and diameter is very likely real. Warning signs of a counterfeit: flat, mushy relief, wrong color tone, a weak or missing reeded edge, or any offer priced below the current gold melt value. Nobody sells real gold for less than the metal is worth. When in doubt, have it authenticated by a professional or submit it to NGC or PCGS.

Where to sell it (and get a fair price)

Because this is a precious-metal coin, sell only where the buyer inspects the piece and confirms the weight in front of you.

• A verified numismatic dealer from the Pesoteca shop directory can appraise it on the spot and pay based on both gold content and collector premium.
• The Pesoteca buy-and-sell forum connects you directly with collectors, who often pay more than a dealer for a nice grade.

Before you sell, photograph the obverse, reverse, and edge in good light, and compare your coin's condition against the ranges above. Do not dump it on social media to the first offer, and never accept a price below melt value.

Have an 1870 20 Pesos and not sure of the mint mark or grade? Post clear photos of both sides in the Pesoteca forum and let collectors weigh in before you decide what it's worth.

20 pesos gold, Mexican Republic, 1870, Mexico City Mint. An onza of the Restored Republic that began after Maximilian's execution in Queretaro on June 19, 1867. Struck under the presidency of Benito Juarez in the final stretch of his fourth term, before the 1871 elections in which he would face Sebastian Lerdo de Tejada and Porfirio Diaz. That year the Organic Laws of the Civil Registry and of the Civil Status of Persons were enacted, consolidating the secularization of public records begun with the Reform. The 20 pesos gold officially weighs 33.84 grams with the 0.875 fineness typical of the inherited colonial balance system. Milled production with a round planchet. The obverse shows the republican eagle on a nopal cactus with a serpent, and the reverse the Phrygian cap with rays and the legend LIBERTAD, French liberal iconography adapted to the context of the Restored Republic. The assayer's initials appear in the field as the mark of the capital's workshop. 1870 pieces are the inaugural issue of the republican 20 pesos gold series and are collectible for documenting the political consolidation of the Juarez regime after the victory over Maximilian's Second Empire.