20 Pesos Maximiliano de Habsburgo 1866 Gold Coin

If you inherited an 1866 gold coin with a bearded emperor on it, you are holding one of the most historically loaded pieces Mexico ever struck: the 20 pesos of Maximiliano de Habsburgo. The good news for a US reader who just wants the bottom line: it contains close to a full ounce of gold, so it has a hard floor worth roughly 1,700 to 1,900 USD in melt value alone (at current gold prices), and genuine examples in collector grades sell well above that.

This coin was struck only in 1866, during the short-lived Second Mexican Empire, when Maximilian I of Austria ruled Mexico under French backing. He was executed in 1867, which is exactly why the coinage bearing his portrait is scarce and sought after. That combination, real gold content plus a one-year historical window, is what drives the price.

What it's actually worth in 2026

Value splits into two layers. First, the metal. Second, the collector premium on top.

The coin weighs 33.59 grams and is struck in .875 fine gold (21 karat), which works out to about 0.945 troy ounces of pure gold. That gives it a bullion floor that moves with the gold spot price. As of 2026, that floor sits in the neighborhood of 1,700 to 1,900 USD depending on the day.

On top of that floor, condition and authenticity decide everything. A worn, circulated example trades close to melt. A sharp, problem-free coin, and especially one certified by NGC or PCGS, carries a strong numismatic premium because so few survive from a two-year regime.

Because official mintage for this issue is not documented in a firm published figure, exact survival numbers are unknown. What we can say honestly: this is not a common date. Collector forums throw around estimates, but none are confirmed, so treat any specific mintage claim you see online with skepticism.

The myth: "an emperor's gold coin must be worth a fortune"

Here is the honest correction. A worn 1866 Maximiliano 20 pesos is worth its gold, plus a modest premium, not tens of thousands of dollars. The pieces that command real money are the high-grade, certified examples where the strike is crisp and the surfaces are clean. Grade is the multiplier. A common-looking coin in a slabbed Mint State grade can be worth several times what the same coin looks like in a dealer's junk-gold tray.

So before you assume you're sitting on a five-figure rarity: check the condition first, then verify it's genuine. That order matters.

How to tell if yours is genuine

Gold fakes of Mexican coins do circulate, and the most common tell is metal content. Counterfeits are frequently struck in lower-purity gold or gold-plated base metal, which almost always throws off the weight.

• Weigh it. A genuine coin weighs 33.59 grams. If yours is off by more than a fraction of a gram, be suspicious.
• Measure it. Diameter should be 39 mm.
• Check the edge. It should be reeded (evenly grooved). A smooth or sloppy edge is a red flag.
• Get it certified. For a coin in this value range, sending it to NGC or PCGS is the definitive answer. Certification confirms authenticity and grade in one step, and a slabbed coin sells faster and higher.

If you plan to buy or sell above the melt value, a professional appraisal is worth the cost. See our coin grading guide to estimate condition before you send anything off.

Where to sell it (US and abroad)

Because this is a precious-metal coin with a known floor, you will always find a buyer. The question is getting a fair number above melt.

1. Certify first if the coin looks clean. A PCGS or NGC grade removes the buyer's doubt and justifies a premium.
2. Sell to established coin dealers, not pawn shops. Pawn shops pay melt at best. A numismatic dealer pays for the history and rarity.
3. Reputable auction houses (Heritage, Stack's Bowers) are the right venue for a high-grade certified example, where Mexican imperial gold draws serious collectors.
4. Verified numismatic shops in the Pesoteca directory will value it on the spot, and the buy-and-sell forum connects you with collectors directly.

Whatever route you take, photograph the coin (obverse, reverse, and edge) and confirm the weight before agreeing to any price. Do not dump it to the first offer on social media.

Have one in a drawer and not sure what grade it is? Post clear photos in the Pesoteca forum and let collectors weigh in before you sell.

Edge: Reeded.