1 Peso 1870 Silver: What This Mexican Coin Is Worth

If you inherited or found an 1870 Mexican 1 Peso, here is the honest answer: in worn condition it trades close to its silver value, roughly 20 to 25 USD as scrap metal in 2026. Clean, high-grade examples with good detail sell for a few hundred dollars, and certified top-grade pieces can push higher. It is not a coin that turns into a fortune, but it is real silver with a genuine floor under it.

This is a piece of Mexico's early Decimal System (Sistema Decimal), the money reform that replaced the old Spanish-colonial "reales" with a peso divided into 100 centavos. The 1870 date sits in the Restored Republic period under Benito Juárez, right after the fall of the short-lived Second Empire. That history is interesting, but for value it matters less than three things: the silver, the condition, and whether it is genuine.

What you actually have

Feature	Detail
Denomination	1 Peso, Decimal System
Year	1870 (single year of this type)
Metal	Silver, .900 fine (90% silver)
Weight	26.89 grams
Diameter	37.5 mm
Edge	Reeded
Mint	Mexico City (Casa de Moneda de México)

At .900 fineness and 26.89 grams, each coin contains about 0.778 troy ounces of pure silver. That is the number that sets the floor. Whatever silver is doing per ounce on the day you check, multiply by roughly 0.78 and you have the melt value. No 1870 Peso in any condition should sell below that number.

What it's worth by condition

Value for a circulated silver coin like this comes down to grade. Here is the realistic range:

• Worn / heavily circulated: essentially melt value, around 20 to 25 USD depending on the silver price.
• Good detail, light wear (VF to XF): roughly 60 to 200 USD, driven by eye appeal and how sharp the design is.
• About Uncirculated to Mint State: several hundred USD, and certified high-grade examples can go well past that when two collectors want the same coin.

Because 1870 is the only year this exact type was struck, there are no year-by-year variants to hunt within it. There can be minor die varieties (letter positions, small striking differences) that only NGC or PCGS graders reliably separate. For a casual owner, a coin is a coin, and condition is what moves the price.

The rarity question

The exact mintage for this issue is not documented in an official published figure. Missing mintage data does not automatically mean "rare and priceless." What we see at auction is a coin that shows up regularly enough that clean examples are attainable, and that keeps prices grounded. If someone tells you an 1870 Peso is worth thousands regardless of condition, they are selling a story, not a coin.

How to tell if yours is genuine

Silver coins of this size are among the most counterfeited, so verify before you celebrate or sell.

1. Weigh it. A real one is 26.89 grams. Off by more than a few tenths of a gram and something is wrong.
2. Measure it. 37.5 mm diameter, reeded (grooved) edge. Cast fakes often have a mushy or plain edge.
3. The ping test. Balance the coin on a fingertip and tap it gently. Real .900 silver rings with a clear, high, sustained tone. Fakes and base-metal copies sound flat and dull.
4. Certification. For anything you think is high grade or high value, send it to NGC or PCGS. A slabbed, graded coin sells faster and for more, because the buyer is not gambling on authenticity.

Where to sell it

• Coin dealers and numismatic shops appraise on the spot and pay fairly for silver, though they build in a margin.
• Serious collector communities get you closer to full retail if you are patient.
• Online marketplaces can bring good prices but attract the most fakes, so always request edge and weight photos from any seller, and provide them when you sell.

Photograph the front, back, and edge in good light, check the condition ranges above, and do not dump it on the first lowball offer. As real silver, it always has a buyer.

For more Mexican silver from this era, see our guides on the Restored Republic and Porfiriato period, other Mexican 1 Peso coins, and coins dated 1870.

Got an 1870 Peso in hand and want a second opinion on the grade? Post clear photos of both sides and the edge in the Pesoteca forum and the community will help you place it.

Numismatic type: Scales (Balanza).

Edge: Reeded.