20 Pesos Gold Coin (1873): Value & What to Look For

If you have an 1873 Mexican 20 pesos gold coin, here is the honest answer first: it is a large gold piece, and it is worth real money. Its floor is the gold it contains, and rare high-grade examples sell well above that. This is not a coin worth a few dollars.

The 20 pesos oro is the top gold denomination of Mexico's decimal peso system, introduced after the country moved from the old reales scheme to the peso divided into centavos. It weighs 33.72 grams, measures 35 millimeters across, and has a reeded (grooved) edge. That reeded edge was standard on high-value gold coins of the era, added to make it obvious if someone shaved metal off the rim.

What it's actually worth in 2026

Two things set the price: the gold content and the grade.

The metal floor. This is a substantial gold coin. Any genuine 1873 20 pesos will always be worth at least its melt value, which tracks the daily gold price. Because it holds close to an ounce of gold in a heavy 33.72-gram body, that floor alone runs well into four figures in USD at current gold prices. No collector will sell you one below melt, and no honest buyer will pay you far under it either.

The collector premium. Above the melt floor, value depends on condition. 19th-century Mexican 20 pesos gold coins are among the most sought pieces in the Mexican gold series, both for the metal and because they are scarcer than the smaller denominations. A worn, cleaned, or damaged example trades close to melt. A sharp coin with full detail and original luster commands a strong premium over melt, and top-graded examples bring the highest figures in the series.

For a precise number on your coin, the grade is everything. A coin certified by NGC or PCGS in a high Mint State grade is a different asset from a scratched, circulated one of the same date.

Don't confuse it with the Centenario

Many people who inherit Mexican gold assume they have a Centenario, the 50 pesos gold coin first struck in 1921. That is a different, later coin. Your 1873 piece is an earlier Republican gold issue, and its scarcity and history can make a nice example more interesting to collectors than a common bullion Centenario. Check the denomination stamped on the coin: this one reads 20 pesos.

How to check if yours is genuine

Gold coins get counterfeited, so verify before you buy or sell.

• Weigh it. Use a jewelry scale. A genuine coin should be very close to 33.72 grams. Fakes are often off in weight because base metals don't match gold's density.
• Measure it. The diameter should be 35 millimeters. Check with calipers.
• Check the edge. It should be reeded (evenly grooved). A smooth or sloppy edge is a warning sign.
• Look at the strike. Flat, mushy relief or oddly colored patches suggest a cast fake or a plated base-metal copy.
• Be suspicious of bargains. Any offer well below the gold value is a red flag, not a deal.

For anything valuable, the safest move is professional certification. A coin in an NGC or PCGS holder is authenticated, graded, and far easier to sell at full value.

Where to sell it

Because this is a precious-metal coin, only deal with people who will show you the piece and its weight, and verify before any money changes hands.

• A verified numismatic dealer from the Pesoteca directory can appraise it on the spot and quote you against both melt and grade.
• The Pesoteca buy-and-sell forum connects you directly with collectors, which often beats a quick sale to a bulk gold buyer.

Before you list or sell, photograph the obverse, reverse, and edge in good light, and note the weight. Don't dump a gold coin on a social-media marketplace to the first bidder; you will likely leave money on the table.

Got one in the family and not sure what grade it is? Post clear photos of both sides in the Pesoteca forum and let collectors help you pin down its value.

20 pesos gold Mexican Republic, 1873, Mexico City Mint. The first full year under the presidency of Sebastián Lerdo de Tejada, who was promoting the consolidation of the Reform Laws in the Constitution of 1857. That year the Reform Laws separating Church and State were raised to constitutional rank, and additional secularization laws were decreed that caused the second closure of convents and monasteries. It was also the year of the inauguration of the Mexico City-Veracruz railway, the country's first interoceanic railway, a key work of Lerdo's economic modernization. The ounce officially weighs 33.84 grams with 0.875 fineness. Produced by mill press with a round planchet. The obverse shows the republican eagle on a nopal with a serpent, and the reverse the Phrygian cap with rays and the legend LIBERTAD. The assayer's signature appears in the field. Pieces from 1873 are collectible for a triple context: constitutional consolidation of the Reform Laws, inauguration of the first interoceanic railway, and the start of the Lerdo cycle after the death of Juárez.