4 Maravedís of Carlos y Juana: America's First Copper Coin

If you have a 4 maravedís of Carlos y Juana, you are holding the first copper coin struck in the Americas, minted in Mexico City starting in 1536. That historical weight makes well-preserved examples genuinely collectible, with values that range from roughly 100 dollars for a worn, low-grade piece into the low thousands for a sharp, certified example. This is not a common coin you found in a coffee can, so let's figure out what yours actually is.

What this coin is

The "4 maravedís" (pronounced ma-ra-veh-DEES) was a low-denomination copper coin in the Spanish colonial monetary system. The maravedí was the base unit of account, used for small everyday transactions in early New Spain (colonial Mexico). This particular issue carries the names of Carlos y Juana: Carlos I of Spain (better known as Emperor Charles V) and his mother Juana, who reigned jointly.

The coin was struck at the Casa de Moneda de México (the Mexico City Mint), founded in 1535 and the oldest mint in the Americas. That makes the 4 maravedís one of the first coins, and the first copper coin, produced anywhere on the American continent.

Technical specs (memorize these before you buy or sell)

Feature	Detail
Metal	Copper
Weight	6.07 grams
Diameter	27 mm
Edge	Plain (unmilled)
Mint	Casa de Moneda de México
Reign	Carlos I and Juana of Spain
Period	Mid-1500s (issue begins circa 1536)

If the piece in your hand does not weigh close to 6.07 grams or is not around 27 mm across, treat it as suspect until proven otherwise.

What it's actually worth

Here is the honest answer most sites avoid: copper colonial coins are almost always found heavily worn, because copper circulated hard and corrodes. That condition problem is exactly what drives the price spread.

• Low grade (heavily worn, corroded, weak design): roughly 80 to 250 dollars. Common condition for this coin.
• Mid grade (readable design, honest wear): roughly 300 to 800 dollars.
• High grade / certified (sharp detail, minimal wear): low thousands of dollars, and truly exceptional certified examples can go higher.

Because survival in good condition is rare, grade is the single biggest factor here, more than the date. Two coins of the same type can differ by a factor of ten in price purely on preservation.

These are ranges, not fixed quotes. Actual auction results move with demand for early colonial copper, which has a smaller collector base than, say, Mexican gold. A certified NGC or PCGS piece will always outsell a raw one, sometimes by a wide margin, because buyers of expensive coins want the authentication built in.

The myth to ignore

No, a 4 maravedís is not worth a fortune just because it is almost 500 years old. Age alone does not create value. What creates value here is the combination of historical status (first copper coinage of the Americas) and the difficulty of finding a well-preserved example. A crusty, unreadable copper disc is a relic, not a payday. Be realistic about condition before you get excited about price.

How to tell if yours is genuine

Early colonial copper is faked, and it is also frequently confused with corroded modern replicas or damaged unrelated coins. Check these before anything else:

1. Weight and size. It should sit near 6.07 grams and 27 mm. Off by a lot? Probably not authentic.
2. Relief and detail. Genuine struck coins show crisp, dimensional detail even when worn. Casts and fakes look flat, soft, or grainy. Compare against reference photos of authenticated examples.
3. Edge. The edge is plain (unmilled). A reeded or lettered edge is wrong for this piece.
4. Surface honesty. Colonial copper shows real age: even, dark patina, honest wear. A suspiciously uniform "aged" look can signal artificial treatment.

For any piece you think might be worth several hundred dollars or more, third-party grading from NGC or PCGS is the definitive step. They authenticate, grade, and seal the coin, which both protects you and raises resale value.

Where to sell it

Because this is a genuinely collectible early colonial coin, avoid dumping it on the first buyer.

• Certify first if it's high grade. Send a strong example to NGC or PCGS. A slabbed coin sells faster and higher.
• Auction houses with a world/colonial coin department. Firms like Heritage Auctions and Stack's Bowers regularly handle Spanish colonial material and reach the specialist buyers who pay for it.
• Established dealers in Mexican and colonial coins for a fast, in-person appraisal.
• Collector marketplaces, but only with full photos (obverse, reverse, edge) and verified weight. This is where fakes and misattributions concentrate, so buyers are cautious and so should you be.

Photograph the coin front, back, and edge in good light, note the exact weight, and compare against the ranges above before you accept any offer.

Related reading on Pesoteca: Spanish colonial coins minted in Mexico, how coin grading works and why it matters, and the Pesoteca dealer directory to find a verified buyer near you.

Got one and want a second opinion on grade or authenticity? Post clear photos of the obverse, reverse, and edge in the Pesoteca forum and let collectors who handle early colonial copper weigh in before you sell.

The Mexican Mint, founded by royal charter in 1535, was the first mint on the American continent. Under the joint reign of Carlos I of Spain and his mother Juana, it began to strike coinage to supply currency to the nascent economy of New Spain.

The copper 4 maravedíes belong to those first issues. The maravedí was the low-denomination unit of the Spanish system, and these pieces settled the minor everyday transactions while silver was reserved for larger trade.

As the foundational issue of American numismatics, the coin of Carlos and Juana has an exceptional historical value: it marks the beginning of three centuries of colonial minting in Mexico.