Maximilian Peso: The 1866 Silver Peso of Mexico's Second Empire

If you inherited a silver peso with a bearded man's profile and the word MAXIMILIANO around the edge, you have a genuine piece of Mexican history that most collectors actually want. In circulated grade it runs roughly 40 to 150 USD. A sharp, uncirculated example of a scarce mint and date can bring 1,000 to over 3,000 USD at auction. This is one of the few old Mexican coins where the myth of "old means valuable" is partly true.

What you actually have

The Maximilian Peso (1 peso, Emperor Maximilian of Habsburg) was struck during Mexico's Second Empire, the short-lived monarchy propped up by the French intervention. Maximilian was placed on the throne in 1864 and executed in 1867, so the imperial peso is a coin from a regime that lasted only a few years. That short window is exactly why collectors chase it.

Key specs to confirm what you have:

• Denomination: 1 peso
• Metal: silver, .903 fine (roughly 90 percent silver)
• Weight: about 27.07 grams
• Diameter: about 37 to 39 mm
• Obverse: the right-facing profile of Maximiliano, with the legend MAXIMILIANO EMPERADOR
• Reverse: the imperial eagle with crown, the date, and the mint mark
• Dates struck: 1866 for most circulation pesos (a very small 1867 issue exists)

The most commonly seen dated peso is 1866. If your coin reads 1866 Mo (the Mo is the Mexico City mint mark), you have the standard type. Other mint marks such as Ga (Guadalajara), Pi (San Luis Potosí), and others exist and change the value significantly.

What it's worth in 2026

Value comes down to three things: mint mark, date, and grade. The Mexico City (Mo) 1866 is the most available. Branch mints and the 1867 issue are rarer and worth more.

Type	Grade	Approximate value (USD)
1866 Mo (Mexico City)	Good to Fine (worn)	40 to 120
1866 Mo	Very Fine to Extra Fine	150 to 400
1866 Mo	About Uncirculated / Uncirculated	500 to 1,500
1866 branch mint (Ga, Pi, etc.)	Very Fine and up	400 to 2,500+
1867 Mo	any grade	1,000 to 4,000+ (scarce)

Certified high-grade examples have crossed the 3,000 to 5,000 USD mark at major auction houses like Heritage and Stack's Bowers, especially for the scarcer mints. Well-worn 1866 Mo pieces, the ones most people inherit, sit in the low hundreds. Even a heavily circulated example almost never drops to melt value alone, because collector demand keeps a floor under it.

At current silver prices, the metal in one coin is worth roughly 20 to 25 USD (about 0.786 troy ounces of silver). That's your absolute floor. The Maximilian Peso trades well above melt for nearly every honest example, so if someone offers you only the silver value, walk away.

Why this coin holds value when most old Mexican coins don't

Most old Mexican coins people bring us are worth a few dollars. The Maximilian Peso is different for concrete reasons:

1. Short reign. The Second Empire existed for about three years. Fewer years means fewer coins.
2. Historical weight. It's the only Mexican coin carrying the portrait of a European emperor who ruled Mexico. That story sells.
3. Silver content plus demand. Nearly 90 percent silver gives it an intrinsic floor, and steady collector demand pushes the price well past that floor.
4. Condition scarcity. These coins circulated hard. Truly uncirculated survivors are genuinely rare, which is where the four-figure prices come from.

The myth to ignore

Online you'll see claims that any Maximilian Peso is worth thousands. Not true. A worn 1866 Mo, the most common variety, is a 40 to 150 USD coin. The four-figure prices belong to high grades and scarce mints only. Don't let a seller (or a hopeful relative) tell you a rubbed, scratched circulated piece is a five-figure rarity. Grade and mint mark decide everything.

How to tell if yours is genuine

The Maximilian Peso is one of the more frequently counterfeited Mexican coins because it commands real money. Check these before you buy or sell:

• Weight. A genuine coin weighs about 27.07 grams. A jeweler's or kitchen scale that reads to 0.1 g will catch most fakes fast. Off by more than a gram? Be suspicious.
• Diameter. Should measure about 37 to 39 mm.
• Silver test. Real silver rings with a clear tone when balanced on a fingertip and tapped. A magnet should not stick at all (silver is non-magnetic).
• Edge. The genuine coin has a reeded or lettered edge. Cast fakes often show a seam or a soft, mushy edge.
• Detail. Compare the eagle and portrait against verified images. Casts look soft and pitted; the real strike is crisp.

If you're about to spend or accept more than a few hundred dollars, get the coin certified by NGC or PCGS, or have it examined by a reputable dealer. Certification also raises resale value.

Where to sell it

For a coin in this price range, don't dump it at a pawn shop that pays melt. Better options:

• A reputable coin dealer who knows Mexican material and can grade it on the spot.
• Major auction houses (Heritage, Stack's Bowers) if you have a scarce mint or a high grade worth four figures. They reach serious collectors worldwide.
• Certified marketplaces where NGC or PCGS graded coins sell for real money to trusting buyers.

Before you sell, photograph the obverse, reverse, and edge in good light, and confirm the mint mark and date. Those three details set your price. Get a second opinion if the first offer feels low.

Have a Maximilian Peso and not sure of the mint mark or grade? Post clear photos of both sides and the edge on the Pesoteca forum and the community will help you pin down exactly what you have and what it's worth.

Ferdinand Maximilian Joseph Maria of Habsburg-Lorraine (in German, Ferdinand Maximilian Joseph Maria von Habsburg-Lothringen; Vienna, Austrian Empire; July 6, 1832 – Cerro de las Campanas, Querétaro, Second Mexican Empire; June 19, 1867) was an Austrian noble, politician, and soldier. He was born with the title of Archduke of Austria as Ferdinand Maximilian of Austria; however, he renounced that title to become emperor of Mexico under the name Maximilian I. His reign was the only one of the Second Mexican Empire, running parallel to the government led by Benito Juárez. Within Mexican historiography he is also known as Maximilian of Habsburg.

He was the younger brother of the emperor of Austria, Franz Joseph I. In 1857 he married Princess Charlotte of Belgium, the same year he was named viceroy of the Kingdom of Lombardy-Venetia, acquired by Austria at the Congress of Vienna. Two years later, the kingdom rebelled against the House of Habsburg. His policy toward the Italians —too lenient and liberal in the eyes of the Austrian authorities— forced him to resign on April 10, 1859.

With the suspension of foreign debt payments, France —an ally of Spain and the United Kingdom— began an intervention in Mexico in 1861. Although its allies withdrew from the fight in April 1862, the French army remained in the country. As a strategy to legitimize the intervention, Napoleon III backed a group of monarchists from the Conservative Party —opponents of Juárez's liberal government— who gathered in the Higher Board of Government and established the second imperial regency. On October 3, 1863, a delegation of conservatives, on behalf of the Assembly of Notables, offered Maximilian the crown of Mexico; he conditioned his acceptance on holding a referendum accompanied by solid financial and military guarantees. Finally, after months of doubt, on April 10, 1864, he accepted.