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Strike, Surface, Style: NGC's Ancient Coin Grading Method

In ancient coin collecting, traditional adjectives used to describe a coin's condition, such as "Fine," "Very Fine," or "Extremely Fine," tell only part of the story.

These grades largely indicate how much a coin has worn in circulation, but they overlook many other factors that determine the quality and desirability of an ancient coin. A coin may never have entered circulation (Mint State), yet its details might be indistinct due to a weak strike or worn dies. Conversely, a lightly circulated coin might have been struck from a die engraved with exceptional artistic style. To capture this complexity and nuance, Numismatic Guaranty Corporation (NGC), one of the world's leading third-party numismatic grading services, has developed a much more comprehensive evaluation system for ancient coins: Strike, Surface, and Style.  

This three-pillar system separates the quality of an ancient coin into three distinct and fundamental components, offering collectors a much clearer picture. It's like analyzing three different stages of a coin's life: its birth, its life, and its artistic legacy.

1. Strike: The Coin's Moment of Birth (1-5 Scale) The "Strike" grade evaluates the quality of that single moment when the coin was struck. Scored on a scale from 1 to 5, this criterion disregards anything that happened to the coin after it left the mint. It focuses entirely on the production process. The key factors NGC considers when determining the "Strike" grade are:

  • Centering: How well is the design centered on the metal blank (flan)? Are all legends and design elements contained within the flan?

  • Strength and Evenness of Strike: Was the hammer blow applied strongly and evenly enough to transfer all design details to the metal? Or are some areas weak or indistinct?

  • Die State: Were the dies that struck the coin new and sharp, or were they worn, cracked, or rusted after striking numerous coins? A coin struck from worn dies might appear "worn" even if it never circulated.

  • Planchet Flaws: Were there cracks, laminations, or other flaws present on the metal disc (planchet) at the time of striking?  

A 5/5 "Strike" score indicates that the coin was struck from fresh dies with an almost perfectly centered, strong, and sharp strike. A low score, such as 2/5, points to a coin that is significantly off-center, weakly struck, and likely from worn dies.

2. Surface: The Coin's Life Story (1-5 Scale) The "Surface" grade covers the coin's entire life after it left the mint. This includes its time in circulation, centuries spent underground, and its condition after discovery. Like "Strike," this criterion is scored from 1 to 5, and its key components are:

  • Circulation and Use: Are there signs of wear, scratches, graffiti, or edge damage on the coin's surface resulting from circulation?

  • Post-Strike Damage: Are there marks such as "test cuts" or "banker's marks" made to test the coin's authenticity?  

  • Effects of Burial: Is there corrosion, porosity, crystallization, or encrustation on the surface resulting from centuries spent underground?

  • Preservation and Cleaning: Is the coin's surface preserved with original mint luster or an attractive, stable patina? Or are there "cleaning hairlines" or a bright, unnatural appearance due to aggressive or improper cleaning methods?

A 5/5 "Surface" score indicates that the coin's surface is exceptionally well-preserved, with minimal damage, and usually possesses an attractive luster or patina. A low score, on the other hand, points to significant surface issues such as severe corrosion, scratches, or poor cleaning.

3. Style: The Artist's Signature This is not a numerical score but a special designation that can significantly impact a coin's value. NGC adds the "Fine Style" designation to a coin when the skill of the artist who engraved its die is distinctly superior compared to other examples of its type. This recognizes the coin not merely as a numismatic object, but also as a miniature work of art.  

In conclusion, NGC's three-tiered system paints a holistic portrait of an ancient coin. When a collector sees a coin graded as "XF, Strike: 5/5, Surface: 2/5," they understand that it has very little wear, was perfectly struck by the mint, but experienced significant surface issues later in its life. This transparency enables collectors to make informed decisions based on what they value and brings the complex art of ancient coin grading closer to an understandable science.

Source:
https://www.ngccoin.com/specialty-services/ancient-coins/grading.aspx
https://coinadvisor.com/ancient-coin-grading