Coin Grading Explained: The Sheldon Scale

The Sheldon scale, from 1 to 70

American coin grading runs on a 1 to 70 numeric scale, generally credited to Dr. William Sheldon, who originally devised it for large cents in the mid-twentieth century before the hobby adopted it far more broadly. A grade of 1 describes a coin worn essentially smooth, identifiable mainly by its outline and any faintly surviving design; a grade of 70 describes a coin with no wear, no handling marks, and a full, well-centered strike, effectively as struck.

Every point in between describes a step of surviving detail and surface quality, and the scale is not evenly spaced in value. Coins bunch up in the low and middle circulated grades, where large numbers survive, and thin out dramatically as you approach the top, where genuinely flawless survivors are uncommon for almost any series and date.

Grade names from Good to About Uncirculated

Circulated grades carry both a descriptive name and a number: Good (G-4) shows heavy wear with major design elements merged and outlines barely readable; Very Good (VG-8) shows a bit more separation; Fine (F-12) shows moderate wear with most major details visible though flattened; Very Fine (VF-20 through VF-35) shows finer detail returning as wear lessens; and Extremely Fine, also written About Extremely Fine (EF-40 or XF-40), shows only light wear confined to the highest points with strong detail everywhere else.

About Uncirculated (AU-50 through AU-58) sits just short of the line into uncirculated condition, showing only a trace of wear, often on a single high point, with most of the coin's original luster still intact. Learning to see the difference between a well-preserved AU coin and a true uncirculated one is one of the harder skills in grading, and it is exactly where the value can jump the most.

Mint State: luster, strike, and surfaces

Mint State grades (MS-60 through MS-70) describe coins with no wear from circulation at all, but that does not mean identical quality. Graders weigh three things separately: luster, the way light reflects and rolls across the coin's surface from the metal flow lines created at striking, which handling and cleaning disrupt; strike, how completely the dies filled in the design's fine detail, since a weak strike leaves a coin looking softer even with zero wear; and surfaces, the presence or absence of contact marks, scratches, or hairlines picked up from contact with other coins or improper handling, not from circulation.

Proof is a separate idea from all of this: it describes a method of manufacture, using specially prepared dies and planchets struck under higher pressure, usually for presentation or collector sets rather than commerce, and proof coins are graded on their own related scale, denoted PF or PR. A worn proof coin is still described as an impaired proof, not reclassified as a circulation strike.

Why third-party grading changes how a coin trades

Because grading involves real judgment, the market developed independent, professional grading services that examine a coin, assign it a grade, and seal it in a tamper-evident holder, a process collectors call slabbing. The two most established services are PCGS, the Professional Coin Grading Service, and NGC, Numismatic Guaranty Company; both publish their grading standards and both maintain records of what they have certified. A coin encapsulated by either service trades with a level of buyer confidence a raw, ungraded coin cannot match, since the grade has been assigned by an independent party rather than the seller.

That confidence is also why identically dated coins can sell for very different amounts depending on whether, and by whom, they have been graded. None of this replaces learning to grade with your own eyes; organizations such as the American Numismatic Association (ANA) publish grading standards and offer educational resources that are worth working through as your interest grows. the site overview of coins and currency covers identification and value in the same depth.

Protecting a grade once a coin has one

A grade describes a coin as it exists right now, and it can go down. Loose storage in a pocket, a paper envelope, or a cheap flip made from the wrong plastic can add hairlines, tarnish, or a haze that a grader would read as a lower grade than the coin once deserved. PVC-based holders are a particular hazard, since the plasticizer in some soft plastics can migrate onto a coin's surface over months or years and leave a sticky green residue that is genuinely damaging.

The safer habits are simple: store coins in inert holders sold specifically for numismatic use, keep humidity and temperature swings to a minimum, and touch coins by the edge only. A slabbed coin removes most of this worry, since the holder is sealed, but a raw coin you intend to have graded later is worth protecting from the day you acquire it, not just once you decide it might be valuable.

Grading descriptions here are educational and general. They are not a grading opinion on any specific coin and are not an appraisal. For an authoritative grade, submit a coin to a recognized third-party grading service such as PCGS or NGC.

Common questions

What does it mean when a coin is "slabbed"?

Slabbed means a third-party service, most often PCGS or NGC, has examined the coin, assigned it a numeric grade on the Sheldon scale, and sealed it in a tamper-evident plastic holder along with that grade. It is a certification of condition, not a statement of a specific dollar value.

Is Proof a grade like Mint State?

No. Proof describes how a coin was manufactured, using specially prepared dies and planchets, not how worn it is. A proof coin still receives its own numeric grade, written as PF or PR followed by a number, describing its condition within that manufacturing category.