8 Reales Carlos II 1676: Value of Colonial Mexican Silver

If you inherited an 8 Reales Carlos II 1676, you are holding real colonial silver struck in Mexico City over 340 years ago. In 2026, a genuine, identifiable example typically sells for 200 to 3,000 USD or more, depending on how much of the design survives and whether it is certified. Worn, hard-to-read pieces sit at the low end. Sharp, fully legible coins with a clear date bring the big numbers.

This is one of the oldest coins a US household is likely to find in an inheritance, and it is also one of the most faked. Here is what yours is actually worth, how to tell if it is real, and where to sell it.

What this coin actually is

The 8 reales was the Spanish silver dollar, the world trade coin of its era and the direct ancestor of the US dollar. This particular piece was struck under Carlos II (Charles II of Spain) at the Mexico City mint (ceca México), with assayer initial G.

Coins from this period are called cobs (from the Spanish cabo de barra). They were hand-struck on irregular, hand-cut silver blanks, so no two look identical. Expect an uneven, roughly round shape rather than a perfect modern circle. That irregularity is normal and does not lower value on its own.

Exact specifications:

• Denomination: 8 reales
• Year: 1676
• Metal: silver, .900 fine (0.9 ley)
• Weight: 26.75 grams
• Diameter: 39 mm
• Edge: plain (unmilled)
• Mint: Mexico City
• Assayer: G

The silver content alone gives this coin a floor. At .900 fine and 26.75 grams, it holds roughly 0.77 troy ounces of pure silver. That means it can never be worth less than its melt value, whatever the collector market does.

What it is worth by condition

With cobs, condition means legibility: how much of the cross, shield, date, and mint marks you can still read. A blob of silver with no visible design is worth close to melt. A coin where you can read the date and both sides clearly is worth a real premium.

Condition	What you can see	Approximate value (USD)
Heavily worn / corroded	Design mostly gone, no clear date	Melt value, roughly 20 to 40 USD
Circulated, identifiable	Shield and cross visible, partial date	150 to 500 USD
Strong detail, clear date	Full design and date legible	600 to 1,500 USD
Certified high grade (NGC/PCGS)	Verified, sharp strike	1,500 to 3,000+ USD

These are ranges, not fixed prices. Cobs are graded individually because strike quality varied so much by piece. Sea-salvage cobs (recovered from shipwrecks) are a separate market with their own certification and can bring more, or less, depending on documentation.

How to tell if yours is genuine

Colonial silver is one of the most counterfeited categories, both period contemporary fakes and modern reproductions sold as souvenirs. Run these checks before you assume anything.

Weight and size. A real piece weighs 26.75 grams and measures about 39 mm across at its widest. Use a scale accurate to 0.1 gram. If yours weighs 22 grams or 30 grams, it is not a genuine full-weight 8 reales. Cast copies are almost always off on weight.

The look of the strike. Genuine cobs were struck, not cast. Look for sharp, slightly raised design elements. Cast fakes show a soft, mushy surface, sometimes with tiny bubbles or a visible seam around the edge.

The ping test. Balance the coin on a fingertip and tap it gently. Real .900 silver rings with a clear, high, sustained tone. A dull, short thud points to a base-metal fake.

Certification. For any coin you think is worth more than a few hundred dollars, send it to NGC or PCGS. They authenticate and grade it, and a coin in a sealed certified holder sells faster and for more because the buyer takes zero risk. See our conservation grading guide to understand what the grades mean.

The myth to ignore

"It's from the 1600s, so it must be worth a fortune." Age alone does not make a coin valuable. Millions of 8 reales were struck across the colonial period, and worn, unidentifiable examples are common. What drives real money here is legibility, grade, and authentication, not the date on the coin. A crisp, certified piece can be worth 20 times a worn one from the exact same year.

Where to sell it

Because this is a precious-metal coin and a frequent fake target, sell where the buyer can inspect it and where you get a fair, transparent offer.

• Verified numismatic shops: the Pesoteca shop directory lists dealers by city who appraise on the spot without inflated markups.
• Collector marketplace: the Pesoteca buy-and-sell forum connects you directly with collectors.
• Major auction houses: for a certified high-grade example, houses like Heritage or Stack's Bowers reach serious colonial-coin buyers worldwide.

Before you list it, photograph the front, back, and edge in good light, weigh it, and check it against the ranges above. Do not dump it to the first Facebook offer. This coin is part of the Colonial 8 Reales series, a category with steady, informed demand, so patience pays.

Think you have a genuine one? Post clear photos of both sides on the Pesoteca forum and let collectors help you pin down the grade and a fair number before you sell.

This piece belongs to the reign of Charles II of Spain (1665-1700). The last king of the House of Habsburg in Spain. His death without heirs set off the War of the Spanish Succession (1701-1714).

The government of New Spain in 1676 was in the hands of Fray Payo Enríquez de Rivera, archbishop and viceroy, a promoter of public works.

The numismatic type of the piece is cob (macuquina), also called hammer-cut coin. The planchets were shears-cut from a silver bar and struck between hand dies, so no cob has a true edge or a perfectly circular shape. It circulated as a benchmark trade coin across the entire Atlantic for more than two centuries.

The Mexico City mint (crowned Mo mark) operated from 1535 as the first mint in the Americas. Throughout the 17th century it struck cobs almost without interruption, being the main point of issue of struck silver in the Spanish empire. The assayer's initials declared on the piece are G, an official of the Royal Treasury tasked with certifying the silver fineness (0.930 and later 0.903) according to the viceregal standard.

Colonial catalogs trace this piece within the families of the Mexican piece of eight, with prices that respond to rarity by year and assayer's signature.

A year in which Fray Payo Enríquez de Rivera held together the dignities of archbishop and viceroy of New Spain.