8 Reales Álamos 1878 (Resplandor): What It's Worth

If you inherited an old Mexican silver dollar-sized coin marked "8 R" with a cap and sun rays, you likely have an 8 Reales Resplandor from Álamos, dated 1878. The honest answer up front: most examples are worth their silver content plus a modest collector premium, roughly the price of the metal for worn coins, climbing into the low hundreds of USD for sharp, high-grade pieces. It is real silver, so it has a floor value that never goes to zero.

Here is what you actually have and how to figure out what it's worth in 2026.

What this coin is

The 8 Reales was the standard large silver coin of Mexico for centuries, the direct ancestor of the modern peso and the historical "pieces of eight." This one is the Resplandor type, named for the resplandor (Spanish for "radiance" or "sunburst"), the design showing a Phrygian liberty cap over sun rays with the word LIBERTAD. The reverse carries the Mexican eagle devouring a serpent on a cactus, with the legend REPÚBLICA MEXICANA.

The Á or As mint mark tells you it was struck at the Álamos mint, in the state of Sonora, one of several regional mints Mexico operated in the 19th century. Yours is dated 1878.

Technical specs (verify yours against these)

Spec	Value
Denomination	8 Reales
Year	1878
Mint	Álamos (Sonora)
Metal	Silver, 0.900 fine (also cited as 0.9028)
Weight	27.07 grams
Diameter	39 mm
Edge	Reeded
Era	Restored Republic / Porfiriato

The pure silver content works out to roughly 24.4 grams, about 0.78 troy ounces. That is the number that sets your price floor: even a heavily worn example is worth its melt value in silver, which moves with the daily spot price.

What it's actually worth

Value depends on three things, in this order: condition (grade), the strength of the Álamos strike and eye appeal, and the silver spot price on the day you sell. A common date in worn condition trades close to melt. The premium grows with grade.

Condition	Approximate value (USD)
Worn (Good to Fine)	Silver melt value, roughly 20 to 30 USD
Circulated, clear detail (VF to XF)	40 to 100 USD
Lightly circulated to AU	100 to 250 USD
Uncirculated (Mint State, certified)	Several hundred USD, more for top pop pieces

Alámos is one of the scarcer mints for the 8 Reales series, which can push a well-preserved, properly attributed example above the figures a common Mexico City (Mo) coin would bring. But scarcity only pays if the coin is genuine and the grade is real. Do not assume "old plus scarce mint" equals a fortune. It does not. A cleaned or damaged coin drops back toward metal value fast.

The myth to kill

Every week someone is told their 1800s Mexican 8 Reales is worth thousands because it's "over a hundred years old." Age alone means almost nothing here. Millions of these coins were struck across all mints, and they circulated worldwide as trade dollars, so survivors are not rare in worn grades. What commands real money is a scarce mint (Álamos qualifies), a scarce date, high grade, and third-party certification. A polished, scrubbed, or holed coin is worth its silver and little more, no matter how old.

How to check what yours is worth

1. Weigh and measure it. Use a jeweler's scale and calipers. A genuine coin should sit near 27.07 grams and 39 mm. Counterfeits of colonial and republican silver are common, and a wrong weight is the fastest red flag.
2. Read the mint mark and date. Confirm the Álamos mark and the 1878 date. Also note the assayer's initials, which appear next to the value on this type and matter for attribution.
3. Grade it honestly. Wear on the high points of the eagle and the sunburst is what separates a 40-dollar coin from a 200-dollar coin. Use our Mexican coin grading guide to place yours.
4. Check the current silver spot price. That gives you the floor. Never sell a genuine silver coin for less than melt.
5. Get it certified if it looks high grade. For anything that appears uncirculated or unusually sharp, a slab from NGC or PCGS pays for itself by proving authenticity and locking in the grade.

Where to sell it

Sell through people who show you the coin and its weight before money changes hands. A verified numismatic shop from the Pesoteca directory will appraise it on the spot, or you can list it in the Pesoteca buy-and-sell forum among collectors. Photograph the obverse, reverse, and edge, and check the grade ranges on this page before you agree to any price. Because this is a precious-metal coin, avoid dumping it to the first buyer on social media, and be suspicious of any offer below the silver value.

This piece belongs to the broader 8 Reales silver Republic series, which is worth browsing if you have more than one coin from the box.

Have an 1878 Álamos 8 Reales in hand and unsure of the grade? Post clear photos in the Pesoteca forum and let collectors help you pin down what it's really worth before you sell.

In 1878 Porfirio Diaz was in his first presidential term. The consolidation of the Porfirian order with emphasis on pacification, railroads and foreign capital.

The Alamos mint (As) reopened in 1862 during the French Intervention to provide liquidity to the silver mining region of southern Sonora. It worked until 1895 when Porfirian centralization concentrated minting in Mexico and Zacatecas.

As pieces are sought by collectors of the northwest and by mining theme. Annual mintages are relatively low compared with Mexico or Zacatecas.

In catalog reference, the variant of this mint is listed as KM#377 in Krause. The piece is silver at .9028 fineness with a reeded edge and a theoretical weight of 27.07 grams. The 1878 example of Alamos, Sonora corresponds to the phase in the middle stage of the mint (1862-1895) and is identified on the coin by the As mint mark.

The collector building the series by mint usually chases the As examples of the 1870s cycle in lots or par-to-par trades, avoiding middleman resale. It is worth confirming that the piece has a weight close to 27 grams (minting tolerance) and a diameter of 39 millimeters. Pieces resurfacing from local hoards appear periodically on the market and are the best window to obtain high grade without a premium.