8 Reales Felipe IV 1647 (Mexico City Mint): Value & Silver Content

If you inherited a heavy silver Spanish colonial coin dated 1647 with the name Felipe IV, you own an 8 reales struck at the Mexico City mint (Casa de Moneda de México), the oldest mint in the Americas. Most worn examples trade in the tens to low hundreds of US dollars. Sharp, well-struck, or certified pieces climb into the thousands. Metal content sets the floor; strike and eye appeal set the ceiling.

Quick answer: what is it worth

An 8 reales, often called a "piece of eight," was the silver dollar of its era. This 1647 issue from Mexico City is a hammered (hand-struck) colonial coin, not a modern machine-made piece. Because it was made by hand, quality varies wildly, and that variation is exactly what drives price.

• Heavily worn, corroded, or clipped: roughly 40 to 120 USD, essentially trading on silver plus a modest collector premium.
• Decent circulated with a readable date and full cross/shield: about 150 to 600 USD.
• Full, sharp strike with clear legends and no problems: 800 to several thousand USD.
• Certified high grade (NGC or PCGS) or with a documented shipwreck provenance: can exceed 5,000 USD for the right combination of clarity and dated legibility.

Dated 1647 pieces matter to collectors because the date is often off the flan on hammered coins. A fully legible date on this coin adds a real premium over an undated or partial-date example of the same period.

The specs (use these to check yours)

Feature	Specification
Denomination	8 reales
Date	1647
Mint	Mexico City (Casa de Moneda de México)
Ruler	Felipe IV of Spain
Metal	Silver, .900 fine
Weight	27.37 grams
Diameter	38 mm
Edge	Plain (unmilled)
Assayer	P

If your coin does not weigh close to 27.37 grams and measure about 38 mm, treat it as suspect until proven otherwise. A genuine hammered 8 reales can be slightly underweight from clipping, but a piece that is far light or far heavy is a warning sign.

Two types you might have: cob vs. "royal"

The everyday circulating version of this coin is a cob (from the Spanish "cabo de barra"), an irregular, roughly shaped disc cut from a silver bar and struck by hand. Most surviving 1647 pieces are cobs. They look crude and off-center, which is normal and not a defect.

A far scarcer version is the presentation or "royal" strike (galano), a round, carefully centered specimen made for the crown. Genuine royals are rare and command large multiples over ordinary cobs. If your coin is perfectly round with a fully centered, complete design, have it authenticated before you assume it is a common cob.

Why silver content matters here

At .900 fineness and 27.37 grams, this coin contains roughly 0.79 troy ounces of pure silver. That gives it a hard floor: it will never be worth less than its melt value, and there is always a buyer at that price. For a rough silver-only figure, multiply the current spot price per ounce by about 0.79. Everything above that number is the collector premium for date, strike, and rarity.

How to tell if yours is genuine

Counterfeits of Spanish colonial 8 reales are common, both crude cast fakes and more convincing modern copies.

• Weight and diameter first. Cast fakes are frequently off on weight. Use a scale accurate to 0.1 grams.
• The ping test. Balance the coin on a fingertip and tap it lightly. Genuine .900 silver rings with a clear, sustained high note. Cast fakes and base-metal copies sound dull and short.
• Detail under magnification. Cast fakes show soft, mushy detail and tiny surface bubbles. Genuine struck coins have crisp edges even when worn.
• Look for "COPY" or "COPIA". Modern reproductions are often stamped, sometimes in a discreet spot.

For any coin you believe could clear a few hundred dollars, send it to NGC or PCGS. Certification is the definitive answer on authenticity and grade, and it materially increases resale value.

The myth to ignore

"It's from 1647, it must be worth a fortune." Age alone means very little. Millions of 8 reales were struck across the colonial period, and worn cobs are genuinely common. What creates value is a legible date, a full strike, an original surface without harsh cleaning, and ideally third-party certification. A cleaned, corroded, or clipped example is a silver coin with a small premium, not a lottery ticket.

This piece belongs to the broader colonial 8 reales series. Before you assign a number to yours, read the Mexican coin grading guide and compare your coin honestly against the grade brackets above.

Where to sell it

• Verified numismatic shops in the Pesoteca directory: they appraise on the spot and buy fairly, without the markup of a middleman.
• The Pesoteca buy-and-sell forum: collectors who know exactly what a hammered 8 reales is and pay accordingly.
• International auction houses (Heritage, Stack's Bowers): the right venue for high-grade, certified, or royal strikes that deserve global bidding.

Whatever route you choose, photograph the obverse, the reverse, and the edge, note the weight, and get the coin graded if it might clear a few hundred dollars. Do not dump it on a social-media buyer for melt when it may be worth several times that.

Have a 1647 8 reales in hand and not sure if it's a common cob or something rarer? Post clear photos of both sides and the edge in the Pesoteca forum and let collectors weigh in before you sell.

This piece belongs to the reign of Felipe IV of Spain (1621-1665). King during the Thirty Years' War and the separation of Portugal. His favorite was the Count-Duke of Olivares.

The government of New Spain in 1647 was in the hands of Marcos de Torres y Rueda, Bishop of Yucatan, ruling as interim viceroy after the departure of the Count of Salvatierra.

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

The Mexico Mint (crowned Mo mark) operated from 1535 as the first mint in the Americas. During the 17th century it struck cobs almost without interruption, being the main issuing point of struck silver in the Spanish empire. The assayer's initials declared on the piece are P, an official of the Royal Treasury in charge of 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 Mexico Piece of Eight, with prices that respond to rarity by year and assayer's signature.

Year of the interim government of Bishop Torres y Rueda after the departure of the Count of Salvatierra.