Coin Grading Explained: The 70-Point Scale

What is coin grading?

Coin grading is the assessment of a coin's condition on a standard scale, expressed as a number from 1 to 70 with a letter prefix. It gives buyers and sellers a shared language for condition, so a coin described as 'MS-65' means the same thing to a dealer in Florida as it does to one in Oregon.

Grade reflects wear, surface marks, luster, strike quality, and eye appeal. It is not the same as rarity — a common coin can grade very high, and a rare coin can grade low — but for two examples of the same issue, grade is usually what separates a modest coin from a valuable one. See what your coins are worth for how grade fits alongside date, metal, and rarity.

What is the Sheldon grading scale?

The Sheldon scale is a 70-point system that ranks coins from 1 (Poor) to 70 (perfect). It was devised by Dr. William Sheldon in 1949 for early large cents and later adopted across U.S. numismatics, so today every series is graded the same way.

The numbers are not evenly spaced in value — the jump from a worn coin to a mint-state one can be enormous, while two adjacent mint-state grades can also differ sharply in price. The American Numismatic Association publishes the standards most graders follow.

What do the grade abbreviations mean?

Each grade pairs a number with a letter prefix that describes the broad condition band. Circulated coins run from P (Poor) up to AU (About Uncirculated, 50–58); uncirculated coins are Mint State (MS) 60–70; proof coins use PR or PF. The table below maps the common ones.

What's the difference between circulated and mint state?

A circulated coin shows wear from handling and use; a mint-state coin has never circulated and shows no wear, only the marks it may have picked up at the mint. That line — any wear at all versus none — is the most important boundary on the whole scale.

Luster, the original mint shine, is the giveaway: mint-state coins keep their full cartwheel luster, while even lightly circulated coins lose it on the high points. The gap in price across that line is often where the real money sits, which is why the AU-58 versus MS-60 distinction gets so much attention.

A worn circulated coin beside a lustrous mint-state example of the same type

How much does grade affect a coin's value?

Grade can change a coin's value by orders of magnitude. Because higher-grade survivors are scarcer, demand concentrates at the top of the scale, so each grade step up can mean a large price jump rather than a small one.

As a worked example, take a common-date Morgan silver dollar. In a circulated grade it may be worth little more than its silver content. The same date in MS-63 can be worth several times that, and in MS-65 or higher it can climb into the hundreds — same coin, same year, separated only by condition. Our Morgan silver dollar value guide shows how that plays out date by date.

What are PCGS and NGC?

PCGS (Professional Coin Grading Service) and NGC (Numismatic Guaranty Company) are the two third-party grading services the U.S. market trusts most. They independently authenticate and grade a coin, then seal it in a tamper-evident plastic holder — a 'slab' — labeled with the grade.

Their grade carries weight because it is consistent and backed by a guarantee, so a certified coin sells faster and closer to full value than a raw (ungraded) one. When a coin is in a PCGS or NGC slab, buyers are largely paying for the number on the label.

How does professional grading work?

You submit a coin to PCGS or NGC — directly as a member or through an authorized dealer — and pay a per-coin fee based on the coin's value and how fast you want it back. The service authenticates it, multiple graders assign a grade, and it comes back encapsulated.

Many local shops handle submissions for customers, which is the easiest route for most people. A numismatic appraiser or rare coin dealer can tell you whether a coin is worth submitting and prepare it correctly.

What do the extra labels like RD, FB, and + mean?

Beyond the number, graders add designations that capture special quality. These can lift value meaningfully, so they are worth knowing.

Common ones include color codes on copper — RD (red), RB (red-brown), and BN (brown) — and strike designations like FB (Full Bands) on Mercury dimes or FS (Full Steps) on Jefferson nickels. A '+' or a star (NGC) marks a coin at the high end of its grade or with exceptional eye appeal. They reward originality and strike, which is one more reason never to clean a coin.

Should I get my coin graded?

Grade a coin only when the certified value clearly beats the cost of grading. Each submission carries a per-coin fee plus shipping and insurance both ways, so low-value coins rarely justify it.

A simple test: grading tends to pay off on scarcer or higher-grade coins worth comfortably more than the total fee, on coins where authenticity is in question, and on anything you plan to sell to a wider market. For a common circulated coin worth a few dollars, raw is fine. See how coin appraisals work if you mainly need a documented value rather than a slab.

How do I grade a coin myself?

You can estimate a grade at home with good light, a magnifier, and a reference, but treat it as a rough guide rather than the final word. Hold the coin by its edges, tilt it under a single light source, and check the highest points for wear and the surfaces for the original luster.

Compare against published photo standards from PCGS or the ANA for that exact series — grading is series-specific, and a 'Fine' Buffalo nickel does not look like a 'Fine' Lincoln cent. For any coin you think is valuable, get a second opinion at a local coin shop before you rely on your own grade.

A collector examining a coin under a loupe against a printed grading reference

Why you should never clean a coin

Cleaning a coin almost always lowers its grade and its value. Even gentle wiping leaves microscopic hairline scratches and strips the original surface, and graders detect it instantly — a cleaned coin is often labeled 'cleaned' or returned without a numeric grade.

The toning and patina that build up over decades are usually desirable, not dirt. Leave every coin exactly as you found it and let a professional assess it; a cleaned example of a valuable coin can sell for a fraction of an untouched one.

What does the slab actually protect?

The holder does two jobs: it certifies the grade and it preserves the coin. A genuine PCGS or NGC slab is sealed, serial-numbered, and verifiable on the grader's website, which both proves the coin is authentic and protects it from handling and the environment.

Because counterfeit slabs exist, always verify the certification number with the grading service before paying a premium for a certified coin. Our guide on how to spot fake coins covers checking slabs along with the coins themselves.