1 Peso Silver 1866: Maximilian's Emperor Coin

If you have an 1866 Mexican 1 peso with a bearded man on the front, you are holding a silver coin from the short reign of Emperor Maximilian. In 2026, most examples are worth from their silver melt value (roughly 20 to 25 dollars) up to a few hundred dollars for well-preserved pieces. Truly high grades can command more.

Here is the honest breakdown of what drives the price, and how to check what yours is worth.

What this coin actually is

This is the 1 peso silver coin of 1866, struck under Maximilian I (Maximiliano), the Austrian archduke installed as Emperor of Mexico during the Second Empire (Segundo Imperio). He ruled from 1864 to 1867, so the coinage carrying his portrait spans a very short window. That short reign is part of why collectors pay attention to the series.

The obverse shows Maximilian's profile with the legend around it. The reverse carries the imperial eagle and the denomination.

Specifications (verify yours against these)

Feature	Value
Denomination	1 peso
Year	1866
Metal	Silver, 0.900 fine (90% silver)
Weight	26.94 grams
Diameter	36 millimeters
Edge	Reeded
Era	Second Empire (Maximilian)

The 26.94 grams at 0.900 fineness means about 24.2 grams of pure silver, roughly 0.78 troy ounces. That gives the coin a hard floor: even a worn, common example is worth its silver content, which moves with the market price of silver.

What it is worth

Value depends on grade (condition), authenticity, and the mint mark. As a genuine silver crown-size coin, it will never sell for less than its melt value.

Condition	Approximate value (USD)
Well worn (Good to Fine)	Melt value, roughly 20 to 30 dollars
Moderately worn (Very Fine)	50 to 120 dollars
Lightly worn (Extremely Fine)	150 to 350 dollars
About Uncirculated / Mint State	Several hundred dollars, higher for top grades

These are working ranges. Certain mint marks and die varieties are scarcer than others, and a certified high-grade example can sell well above the top of this table. If your coin looks nearly untouched with full detail and original luster, get it professionally graded before selling.

The myth to kill

Because it is old (over 150 years) and carries an emperor's portrait, people assume this coin must be worth thousands. For the average circulated example, it is not. Age alone does not create rarity. This 1 peso was struck as real circulating money, and enough survive that common-grade pieces trade close to their silver value.

The money is in condition. The gap between a worn coin at melt and a pristine certified example is the difference between 25 dollars and several hundred. That is where the real value hides, not in the year on the coin.

How to tell if yours is genuine

Silver coins this size are counterfeited, so check the physical basics first:

• Weigh it. A genuine coin is 26.94 grams. Use a jeweler's scale. A significant miss on weight is a red flag.
• Measure it. The diameter is 36 millimeters. Use calipers.
• Check the edge. It should be reeded (fine vertical grooves). A plain or crude edge is suspect.
• Look at the relief. Fakes often show flat, mushy detail and off color. Genuine silver has a specific tone and weight in the hand.
• Be suspicious of bargains. Any offer far below the silver value is a warning, not a deal.

If the weight and diameter are off, or the detail looks soft, have it examined before you pay or sell. When in doubt, third-party grading services (NGC, PCGS) authenticate and grade in one step.

Where to sell it

To sell the 1866 1 peso for a fair price:

• A verified numismatic shop from the Pesoteca directory can appraise and buy it on the spot, with no middleman markup.
• The Pesoteca buy-and-sell forum connects you directly with collectors who know the series.

Photograph the obverse, reverse, and edge in good light before listing. Because this is a precious-metal coin, only deal with buyers who inspect and weigh the piece in front of you. Avoid dumping it to the first bidder on social media, where silver coins routinely sell for a fraction of their value.

This piece belongs to the Misc 1 Pesos Silver Second Empire series. To pin down your coin's grade before you sell, walk through the coin grading guide and compare against the ranges above.

Got an 1866 Maximilian peso in a drawer and not sure what it grades? Post clear photos of both sides on the Pesoteca forum and let collectors weigh in before you sell.