The Coin Grading Scale Explained: Understanding Every Grade from PO-1 to MS-70

If you've ever looked at a certified coin and wondered what "MS-65" or "AU-58" actually means, you're not alone. The coin grading scale is the backbone of modern numismatics — it determines how coins are valued, traded, and discussed — but it can feel like a foreign language to anyone encountering it for the first time.

The good news is that the system, once you understand it, is logical and practical. It was designed to bring order to a market that desperately needed standardization, and learning it is one of the single most valuable investments you can make as a collector. A solid understanding of the grading scale will help you buy smarter, spot better values, and avoid overpaying for coins that don't deserve their asking price.

This guide breaks down every part of the coin grading scale in plain English — from the history of the system to what each grade actually means when you're looking at a coin in hand.

The History: How We Got the Sheldon Scale

The grading system used today is based on the Sheldon Scale, a 1-to-70 numeric system developed by Dr. William H. Sheldon in his 1949 book on early American large cents. Sheldon originally created the scale as a pricing tool — each number corresponded to a multiple of a base value — but the numismatic community eventually adopted the numeric range as a universal condition measurement.

Before Sheldon, coin grading was entirely adjectival. Dealers described coins as "Good," "Fine," "Uncirculated," or "Gem" with no standardized definitions. A coin one dealer called "Fine" might be called "Very Fine" by another and "Very Good" by a third. This inconsistency created enormous problems for buyers, especially those purchasing coins sight-unseen through mail order.

The modern grading system maps those old adjectival grades onto Sheldon's numeric scale, giving us both a word and a number for each grade level. When NGC and PCGS were founded in the mid-1980s, they adopted this system as their standard, and it has been the universal language of coin grading ever since. You can view the complete grading standards on the NGC Grading Scale page and the PCGS Grading Standards page.

The Circulated Grades: 1 Through 58

Circulated coins are those that show wear from being used in commerce. The amount and location of wear determine the grade. Here's what each major grade level looks like:

Poor (PO-1): The coin is barely identifiable as to type. It's heavily worn, possibly damaged, and only the most basic outline of the design is visible. Coins in this grade are typically collected only for extremely rare dates where no better examples exist.

Fair (FR-2): The design is mostly worn flat, but enough detail remains to identify the coin's type and sometimes the date. Like PO-1, this grade is relevant only for extreme rarities.

About Good (AG-3): The outline of the design is clear, and major design elements are visible, though heavily worn. The date may be partially readable. The rim may blend into the design in some areas.

Good (G-4 to G-6): Major design elements are visible but flat. The date and mint mark are readable. The rim is complete but may show wear. This is the minimum grade most collectors consider acceptable for filling a date set. For key-date coins — like a 1909-S VDB Lincoln Cent or a 1932-D Washington Quarter — Good condition examples can still be worth hundreds of dollars.

Very Good (VG-8 to VG-10): The design shows moderate to heavy wear, but major features are clear. Some finer details — such as hair strands on a portrait — begin to emerge. Letters and numbers in the legends are complete. This grade represents a meaningful step up in eye appeal from Good.

Fine (F-12 to F-15): Even wear across the design with moderate detail visible. About half of the original design detail remains. This is a popular grade for collectors building circulated sets on a moderate budget — the coins look "complete" and attractive without commanding the premiums of higher grades.

Very Fine (VF-20 to VF-35): Light to moderate wear on the high points, with most design details clearly visible. Perhaps two-thirds of the original detail remains. VF coins often represent the best value in the circulated range — they're attractive, detailed, and significantly cheaper than About Uncirculated or Mint State examples.

Extremely Fine (EF-40 to EF-45): Light wear on only the highest points of the design. Nearly all detail is sharp and clear. The coin may retain traces of original mint luster in protected areas. EF coins are beautiful in hand and offer near-uncirculated appearance at a fraction of the Mint State price.

About Uncirculated (AU-50 to AU-58): The slightest trace of wear on the very highest points. Most of the original luster is present. At AU-58, the coin may be nearly indistinguishable from a low-end Mint State coin to the untrained eye — the difference often comes down to the tiniest friction on the highest design elements.

One important note: the grades between these major levels (the numbers that are "skipped") exist because the Sheldon Scale originally had more gradations, and the current system preserves those numbers. You'll see coins graded VF-25, VF-30, and VF-35, for instance, each representing a slightly different degree of wear within the Very Fine range.

The Mint State Grades: 60 Through 70

Mint State (MS) coins show no wear from circulation. Every grade from MS-60 to MS-70 represents an uncirculated coin — the differences lie in the quantity and severity of contact marks, the quality of the luster, the sharpness of the strike, and the overall eye appeal.

MS-60 to MS-62: Technically uncirculated but with noticeable contact marks, bag marks, or other imperfections. These coins were never spent, but they may have been jostled around in mint bags or bins during production and distribution. The luster may be impaired by heavy marks. Coins in this range are significantly cheaper than higher Mint State grades but can look noticeably "beat up" despite being uncirculated.

MS-63 (Choice Uncirculated): Moderate contact marks and blemishes, but with reasonably attractive luster and eye appeal. MS-63 is often considered the entry point for collectors who want uncirculated coins without paying gem prices. Many certified gold coins in our inventory are in this grade range, offering uncirculated quality at accessible premiums.

MS-64 (Near Gem): Light contact marks, with above-average luster and strike. The coin is attractive and clean-looking, with only minor imperfections visible. MS-64 represents excellent value in many series — the step from MS-63 to MS-64 is typically moderate in price, while the step from MS-64 to MS-65 can be dramatic.

MS-65 (Gem Uncirculated): Only minor contact marks or hairlines, with strong luster, good strike, and attractive eye appeal. This is the grade most collectors consider the sweet spot — a coin that's genuinely beautiful in hand and meets the "gem" standard that has historically been the benchmark for quality. At MS-65, most coins begin to command significant collector premiums above their base metal or lower-grade values.

MS-66 (Gem+ Uncirculated): A sharply struck coin with minimal marks and excellent eye appeal. The step from MS-65 to MS-66 often represents a meaningful price jump, as truly clean, well-struck coins become scarce at this level for most series.

MS-67 to MS-69 (Superb Gem): Virtually flawless coins with exceptional luster, strike, and eye appeal. Only the most minor imperfections visible under magnification. For classic coins — Lincoln Cents, Washington Quarters, Franklin Half Dollars — these grades are extremely rare and command significant premiums. For modern coins, higher grades are more common due to improved minting technology and handling.

MS-70 (Perfect Uncirculated): A coin with absolutely no post-production imperfections at 5x magnification. This grade is essentially reserved for modern coins — achieving a truly perfect coin from a vintage die-struck series is almost impossible. For modern bullion and commemorative issues, MS-70 and PF-70 grades are attainable and popular with collectors pursuing "perfect" sets.

Proof Grades: PF-60 Through PF-70

Proof coins are struck using a special process — polished dies, polished planchets, and multiple strikes — that produces coins with mirror-like fields and sharp, frosted design elements. Proofs are not a grade; they're a method of manufacture. A proof coin is then graded on the same 60-70 scale used for Mint State coins, but with the prefix PF (NGC) or PR (PCGS) instead of MS.

The grading criteria for proofs focus on the quality of the mirrored fields (looking for hairlines, haze, and contact marks) and the contrast between the fields and devices. Proofs with exceptional contrast between deeply mirrored fields and thick, white-frosted devices receive additional designations:

Cameo (CAM): Noticeable contrast between fields and devices, but the frosting may not be complete or may be lighter in some areas.

Deep Cameo (DCAM) or Ultra Cameo (UCAM): Thick, bold frost on the devices with deeply reflective mirror fields across the entire coin. These coins are visually stunning and command the highest premiums in any proof series. NGC uses "Ultra Cameo" while PCGS uses "Deep Cameo" — the terms describe the same quality level.

Cameo and deep cameo designations can dramatically increase a proof coin's value. A Franklin Half Dollar proof in PF-67 might be worth a few hundred dollars, while the same coin with a Deep Cameo designation could be worth thousands or tens of thousands.

Details Grades: When Something's Wrong

Both NGC and PCGS assign "Details" grades to coins that have been cleaned, damaged, repaired, or otherwise altered in ways that prevent a straight numeric grade. A Details grade indicates the coin's wear level (e.g., "AU Details") but also identifies the problem (e.g., "Cleaned," "Scratched," "Tooled," "Environmental Damage").

Details-graded coins are significantly less valuable than straight-graded coins of the same wear level. A coin graded "MS-63 Details — Cleaned" might sell for 50% to 80% less than a straight MS-63 of the same type. This is one of the key reasons buying certified coins matters — a straight grade from NGC or PCGS tells you the coin passed surface examination and has no problems that would trigger a Details designation.

Plus Grades, Stars, and Other Designations

Both grading services offer additional notations that further refine a coin's grade:

Plus (+) grades: NGC assigns a "+" to coins at the high end of their assigned grade, approaching the next level. An NGC MS-64+ is a coin that's better than a typical MS-64 but didn't quite make MS-65. Plus grades typically carry modest premiums over the base grade.

Star (*) designation: NGC's star indicates exceptional eye appeal beyond what the numeric grade reflects. A coin with a star has something special — outstanding toning, unusual luster quality, or striking visual impact — that sets it apart from other coins at the same grade level.

CAC stickers: The Certified Acceptance Corporation reviews coins already graded by NGC or PCGS and applies a green sticker to coins they believe are solid or above-average for the grade, and a gold sticker to coins they believe are undergraded. A CAC sticker adds value and collector confidence to any certified coin.

Why This All Matters for You

Understanding the grading scale isn't just academic — it's practical knowledge that directly impacts your wallet. When you can look at a certified coin's grade and understand exactly what it means, you can make informed decisions about whether a coin is worth its asking price, whether it fits your collection goals, and whether it represents good long-term value.

At Certified Coin Vault, every coin we sell carries a grade from NGC or PCGS. When you see a coin listed as MS-65 or PF-69 Ultra Cameo in our inventory, you now know exactly what those numbers mean — and that gives you the confidence to buy with your eyes open.

Ready to put your grading knowledge to work? Browse our certified pennies, quarters, half dollars, gold coins, and collectible currency. And if you have questions about any specific grade or coin, reach out — we're always happy to talk numbers.