20 Pesos Gold 1877 (Decimal): Value, Weight & How to Sell

If you inherited an 1877 Mexican 20 pesos gold coin, here is the fast answer: it is real gold, and even the most worn example is worth its melt value, roughly 2,000 USD or more depending on the spot price. A clean, high-grade piece can bring several times that. This is one of the few old Mexican coins that is genuinely worth serious money, because it is made of gold, not because of any myth.

What you actually have

The 1877 20 pesos is a large gold coin from Mexico's Sistema Decimal (the decimal system Mexico adopted after the 1857 monetary reform, replacing the old "reales"). Here are the hard specs, which matter for both value and authenticity:

• Metal: gold, 0.875 fine (21 karat)
• Weight: 33.78 grams
• Pure gold content: about 29.56 grams, roughly 0.951 troy ounces
• Diameter: 34 mm
• Edge: reeded (grooved)
• Mint: Mexico City (Casa de Moneda de México)

That gold content is the floor under this coin. At current gold prices, just under one troy ounce of pure gold sits well above 2,000 USD. No matter how worn your piece is, a bullion dealer or gold buyer will pay close to melt for it. That is the single most important fact for anyone who just found one in a drawer.

What it is worth

Value breaks into two layers: the gold itself, and the collector premium on top.

For a heavily circulated, worn example, expect the price to track melt value, roughly 2,000 to 2,500 USD depending on where gold trades the day you sell. This is the realistic number for most inherited coins that spent years in circulation.

For a sharp, lightly worn or uncirculated piece, especially one certified by NGC or PCGS in mint state, the collector premium kicks in and the price climbs above melt. How far above depends on the grade and how scarce that specific date and mint mark turn out to be.

Condition	What it means	Approx. value (USD)
Circulated / worn	Visible wear, details soft	Melt value, ~2,000 to 2,500
About uncirculated (AU)	Light wear, strong detail	Melt plus a modest premium
Uncirculated / MS certified	No wear, graded by NGC/PCGS	Several thousand, grade-dependent

We give ranges rather than a single figure on purpose. Gold moves daily, and the collector premium depends entirely on grade and eye appeal. Anyone quoting you one exact price without seeing the coin is guessing.

Is it rare?

Honest answer: the exact mintage for this issue is not clearly documented, so we will not invent a number. What we can say is that 19th-century Mexican gold in this denomination is not common, and survivors in high grade are scarcer still. Rarity here is driven by grade far more than by the date alone. A worn 1877 is worth its gold; a pristine, certified 1877 is worth a premium because few survived that clean.

Do not confuse this coin with the 20th-century Centenario, the famous 50 pesos gold coin Mexico has restruck for decades. That is a different, much more common bullion piece. The 1877 20 pesos is an older, genuinely scarcer coin.

The myth to ignore

"Old coin means fortune" is wrong for almost every Mexican coin. This one is the exception, and only because it is gold. Its value comes from metal content and, for top grades, from real scarcity of well-preserved survivors, not from age by itself. A common gold coin from 1877 in worn condition is worth exactly what its gold is worth, no more.

How to tell if yours is genuine

Gold fakes almost always fail on physics. Use the specs above as your first test:

1. Weigh it. A genuine piece weighs 33.78 grams. Counterfeits, often lower-karat gold or plated base metal shipped from overseas, rarely hit that number. A jeweler's scale settles most doubts in seconds.
2. Measure it. Diameter should be 34 mm, with a reeded edge.
3. Check the sound and shine. Gold has a soft, warm luster and a distinctive ring, but weight and diameter are the reliable tests.
4. Get it certified for high-value pieces. If your coin looks uncirculated or you are buying one above a few thousand dollars, professional grading by NGC or PCGS is the definitive insurance. A slabbed, authenticated coin also sells faster and higher.

If the weight or diameter is off, you have a fake, full stop.

Where to sell it

Because this is a precious-metal coin, you have two paths:

• Sell for melt: any reputable gold or bullion dealer will pay close to the metal value. Fast and simple, but you leave the collector premium on the table if your coin is high grade.
• Sell as a collectible: a coin dealer or numismatic firm, a graded-coin auction (Heritage and Stack's Bowers both handle Mexican gold), or a serious collector community. This is the route for AU and mint-state pieces where the premium is real.

Whichever you choose, only deal with buyers who inspect the coin in person or verify photos of both faces and the edge. Get it graded first if it looks clean, and compare at least two offers before you sell. For an even-handed appraisal or to reach collectors directly, the Pesoteca forum is a good place to post clear photos before you commit.

Gold gives you leverage here: there is always a buyer, so never accept the first lowball offer.

Want a second opinion before you sell? Post front, back, and edge photos of your 1877 20 pesos in the Pesoteca forum and let collectors weigh in on grade and a fair price.

Numismatic type: Balance scale.

Edge: Reeded.