1/2 Real of Carlos II, 1668: Value of Colonial Silver

If you inherited or found a small silver coin dated 1668 with Spanish inscriptions, you likely have a 1/2 real of Carlos II, one of the earliest coins struck at the Mexico City Mint (Casa de Moneda de México) under Spanish colonial rule. Depending on condition, these run from roughly 30 dollars for a worn, corroded example to several hundred dollars for a sharp, certified piece. It is genuinely old and genuinely silver, but old alone does not mean a fortune.

What it actually is

This is a medio real (half real), a tiny silver denomination that circulated across the Spanish Empire, including what is now Mexico and the United States, long before either country existed as we know them. Carlos II (Charles II of Spain) reigned from 1665 to 1700, so a 1668 date puts this coin near the start of his reign.

Most surviving 1/2 reales from this era are what collectors call cobs: hand-struck, irregularly shaped coins cut from a silver bar and stamped by hand. They are almost never perfectly round, and the design is usually partial. That irregularity is normal for the period, not a defect.

Specifications

• Metal: silver, .900 fineness (90% pure silver)
• Weight: 1.67 grams
• Diameter: 16 mm
• Edge: plain (unmarked)
• Mint: Mexico City (Casa de Moneda de México)
• Era: Spanish Colonial (Virreinato)
• Year: 1668

A quick reality check: at 1.67 grams of .900 silver, the pure melt value is a fraction of a gram of silver, well under 2 dollars. The value of this coin is not in its metal. It is in age, historical demand, and above all condition.

What it's worth

With hand-struck colonial coins, condition and legibility drive almost everything. A coin where you can read the date, the cross, and the shield is worth far more than a worn, corroded slug of the same type.

Condition	What you can see	Approximate value (USD)
Poor / heavily worn	Barely identifiable, corrosion	20 to 50 dollars
Fine, circulated	Partial design, date faint or gone	60 to 150 dollars
Very Fine to XF	Clear cross, shield, partial date	150 to 400 dollars
Certified high grade	Sharp strike, full detail, slabbed	400 dollars and up

These are indicative ranges for the type. Exact figures move with the collector market and with each individual coin. A rare mint mark or assayer variety, or a fully dated example, can push well past the top of this table. A damaged or holed piece drops below it.

The myth to kill

Because the coin is over 350 years old, people assume it must be worth thousands. That is rarely true. Colonial 1/2 reales were produced in large numbers over many years, and plenty survive. Age creates interest, not automatic rarity. What commands real money is a well-preserved, clearly dated, professionally graded example, and those are the minority.

The date matters too. A legible "1668" adds value; a coin where the date wore off is worth much less, because collectors of this series often build sets by year and mint mark.

How to tell if yours is genuine

Colonial silver is faked, so verify before you buy or sell.

1. Weight and size. A genuine 1/2 real weighs about 1.67 grams and measures around 16 mm. Modern cast fakes are often too heavy, too light, or the wrong diameter.
2. Silver ring test. Real silver gives a clear, high, sustained ring when balanced on a fingertip and tapped lightly. A dull, short thud suggests a base-metal fake.
3. Struck, not cast. Genuine cobs were hammer-struck, so the design elements have sharp edges and slight metal flow. Cast fakes show soft, mushy detail and sometimes a seam around the edge.
4. Professional grading. For any coin you think is worth more than about 150 dollars, third-party certification from NGC or PCGS is the definitive answer. They authenticate, grade, and seal the coin, which also raises resale value.

Where to sell it

Before selling, photograph the obverse, reverse, and edge in good light, and check your grade against the conservation grading guide.

• Certified auction (best for quality pieces). If your coin is sharp and dated, get it graded and consign it to a house that handles world coins, such as Heritage Auctions or Stack's Bowers. Colonial Mexican silver has a steady international audience.
• Verified dealers. A trustworthy shop can value it on the spot. Use the Pesoteca dealer directory to find one without paying a middleman markup.
• Collector marketplaces. The Pesoteca buy-and-sell forum connects you with collectors who actually understand this series and pay fair prices.
• Avoid dumping it on a general Facebook listing at the first offer. That is where colonial coins get underpriced and where the most fakes circulate.

Whichever route you choose, deal only with someone who lets you verify weight and see the coin in hand before money changes hands.

Not sure whether your 1668 half real is a common worn cob or a sleeper worth grading? Post clear photos of both sides and the edge in the Pesoteca forum and let collectors who know the series weigh in before you sell.

Numismatic type: Cob (macuquino).

Edge: Plain edge.