Collector Reference

Coins 101

This page is designed to give you a complete, practical understanding of coins and how they are evaluated within the hobby of numismatics. The goal is to help you recognize and understand everything you are looking at when you pick up a coin, whether you are just starting out or building on existing knowledge.

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Collector Checklist

What to look for first

Date and mintmark
Denomination and design type
Overall wear and sharpness
Luster, color, and originality
Any signs of cleaning, damage, or corrosion

Collector insight

If a coin looks unnatural, weak in odd places, or just “off,” trust that instinct. Strange details, odd surfaces, or incorrect-looking design elements can sometimes be clues that a coin has been altered, cleaned, or may even be a counterfeit.

Condition

Grading Scale Explained

Coins in the United States are most commonly graded using the Sheldon Scale, which runs from 1 to 70. This scale is used to describe the condition of a coin, starting at the lowest end with barely identifiable pieces and ending with coins that are nearly perfect.

At a basic level, grading is about how much of the coin’s original detail and surface quality remains. In practice, it goes deeper than that. Collectors and grading services look at wear, luster, marks, strike, eye appeal, and originality together. That is why two coins can have the same numeric grade but still look noticeably different.

PO1 (Poor 1)This is the lowest collectible grade. The coin is extremely worn, with almost all detail gone. Major design elements may only be visible as outlines, and the date, lettering, or mintmark can be weak or partly missing. A coin in PO1 is usually collected because it is rare, needed for a lowball set, or simply because it is still barely identifiable.

FR2 (Fair 2)A Fair coin is still heavily worn, but slightly more identifiable than PO1. Major outlines of the design are easier to make out, and the date is usually more visible, though still weak. Most finer design detail is gone, and rims may be worn nearly into the fields. These coins are collected more for identification and completeness than for visual appeal.

AG3 (About Good 3)An About Good coin is very worn but generally recognizable without much effort. The date and main design are usually readable, though weak in places. Lettering may blend into the rim, and almost all finer detail is missing. This grade is often seen on heavily circulated classic coins that survived long use in commerce.

G4–G6 (Good)Coins in the Good range are still heavily worn, but the major design, date, and lettering are clearly visible. Most inner detail is gone, and the coin will appear flat overall, but enough remains to make the piece easy to identify. This is often the point where a coin becomes more practical for basic set building if a collector cannot afford finer grades.

VG8–VG10 (Very Good)A Very Good coin shows more inner detail than Good, though it is still obviously circulated. More of the design begins to separate, rims become stronger, and major elements are easier to appreciate. The coin still has significant wear, but it begins to look more complete and balanced. This grade can be appealing for early collectors who want a little more detail without paying much more.

F12–F15 (Fine)A Fine coin has moderate, even wear, but still retains a solid amount of design detail. Major elements are clear, central devices are better outlined, and the coin has more visual appeal than the lower circulated grades. At this level, the coin starts to feel more collectible as an actual example rather than simply a placeholder. Many classic coins in Fine still offer good character and affordability.

VF20–VF35 (Very Fine)Very Fine coins show strong remaining detail with moderate wear across the highest points. Many inner design features are still visible, and the coin usually has a more complete and attractive appearance. This is a very popular range for classic coins because it often provides a strong balance between affordability and detail. For many older issues, VF is the point where the coin starts becoming much more visually satisfying.

XF40–XF45 (Extremely Fine)Extremely Fine coins show only light wear on the highest parts of the design. Most details remain sharp, and the coin still has strong visual presence. In many series, XF examples can be very desirable because they preserve much of the original design without the cost jump of About Uncirculated or Mint State pieces. This grade is often a sweet spot for collectors who want strong detail and attractive surfaces.

AU50–AU58 (About Uncirculated)About Uncirculated coins show only slight wear, usually limited to the highest points of the design. Much of the original mint luster is still present, and at first glance these coins can look very close to Mint State. The difference is that an AU coin has a trace of actual wear, while a true Mint State coin does not. AU58 is especially popular because it can sometimes have better eye appeal than lower-end Mint State coins while costing less.

PF / PR (Proof)Proof coins are specially made for collectors rather than regular circulation. They are struck with greater care and often show sharper detail, more reflective fields, and stronger contrast between devices and background. Proof coins are graded on the same 1–70 scale, but use the PF or PR designation instead of MS. Surface preservation matters greatly here, because mirrored fields and cameo contrast can make marks and hairlines easier to see.

Understanding Mint State: MS60 through MS70

A Mint State coin has no actual circulation wear. That does not automatically mean it is beautiful or high-end. Mint State only means the coin did not wear down through use in circulation.

MS60 The lowest Mint State grade. The coin is technically uncirculated, meaning it has no actual wear, but overall eye appeal is poor. Expect heavy bag marks, scuffs, and abrasions across both focal and non-focal areas. Luster is often dull, muted, or uneven, and the coin may appear lifeless. Strike can be weak depending on the issue. These coins are usually avoided unless needed for budget reasons or type representation.

MS61 Slightly better than MS60, but still clearly a lower-end Mint State coin. There are still numerous marks and noticeable abrasions, including in focal areas. Luster may be somewhat improved but is often still inconsistent or subdued. Eye appeal remains below average, though the coin may look marginally more presentable than an MS60 example.

MS62 A more acceptable lower-end Mint State coin. Marks are still present and can be noticeable, but they are typically less severe or better distributed than in MS60–61. Luster is more complete, though it may still lack brightness or vibrancy. Eye appeal is average at best, but the coin is generally more balanced and collectible than the lowest Mint State grades.

MS63 Considered “choice” uncirculated but still noticeably marked. Expect moderate to heavy contact marks, including some in focal areas such as the cheek, fields, or main design elements. Luster is present but may be impaired or uneven. Eye appeal is acceptable but not strong. This is often the entry point for collectors seeking Mint State coins at a more affordable level.

MS64 A solid collector-grade Mint State coin. Marks are still present but less severe or better distributed than MS63, with fewer in prime focal areas. Luster is generally more complete and attractive, though not fully vibrant. Eye appeal is clearly improved, making this a popular grade for balancing quality and cost. Many coins at this level begin to show strong originality.

MS65 Gem Mint State. Marks are minor and generally confined to less noticeable areas, with minimal distractions in focal points. Luster is strong, full, and often vibrant. Strike is usually above average for the issue. Overall eye appeal is high, and the coin presents as clearly superior to lower grades. This is a key threshold where quality becomes much more noticeable.

MS66 Premium Gem quality. Very few noticeable marks, and those present are small and well-hidden. Surfaces appear clean at first glance. Luster is strong and consistent across the coin. Eye appeal is excellent, often with above-average strike and surface preservation. Coins in this grade stand out even among other Mint State examples.

MS67 Superb Gem. Only tiny, nearly insignificant imperfections are visible under close inspection. Focal areas are extremely clean. Luster is exceptional, often with a “booming” or highly reflective appearance depending on the series. Eye appeal is outstanding, and coins at this level are often scarce or rare for many classic issues.

MS68 Nearly flawless. Only microscopic imperfections are present, typically only visible under magnification. Surfaces are extremely clean, and luster is intense and undisturbed. Strike is usually sharp. Eye appeal is exceptional and often superior to nearly all surviving examples. Extremely rare in most classic coinage.

MS69 Virtually perfect. Only the slightest imperfections—often barely detectable even under magnification—are allowed. Luster, strike, and surfaces are nearly ideal. This grade is more commonly seen in modern coins but is extraordinarily rare for older issues.

MS70 Perfect as struck under the grading standard. No post-production imperfections are visible even under magnification. Surfaces, luster, and strike are flawless. For classic coins, this grade is essentially theoretical, while for modern issues it is achievable but still represents the absolute top quality.

Collector insight: A one-point change in Mint State can create a very large change in price. Many experienced collectors would rather own a high-end AU58 or MS64 than a lower-end coin in a technically higher bucket that has weaker eye appeal.

Certification

Major Grading Services

PCGS & NGC

PCGS and NGC are usually considered the two dominant grading services. They are often neck and neck, with PCGS typically carrying a slight edge in overall market strength, while NGC remains a very close second and has a particularly strong presence in foreign coinage.

Other services

ANACS still has a long-standing place in the hobby. CACG focuses on stricter standards and quality-first grading. ICG is notable for grading contemporary counterfeits, which most other services avoid.

Problems & Exceptions

Details Coins & Contemporary Counterfeits

Details grading

A Details coin cannot receive a straight grade because of a problem such as cleaning, damage, corrosion, environmental issues, or repair. Not all Details coins are equal. A lightly cleaned rare coin may still be collectible, while a severely damaged common coin may be far less desirable.

The more extreme the issue, the less desirable the coin usually becomes. At the same time, real rarity can sometimes outweigh the problem.

Contemporary counterfeits

These are not modern novelty replicas. Contemporary counterfeits were made during the same time period as the genuine issues and intended to circulate alongside them. Today, they are collected for their history, unusual manufacture, and the story they tell about commerce at the time.

Styles of Collecting

How People Build Collections

Pocket Change & Roll Hunting

Usually the starting point. Collectors look for older coins, silver, wheat cents, errors, and unusual pieces in circulation or bank rolls—not normally high grades.

Type Collecting

One example of each design. A great way to learn the history of U.S. coinage without needing full sets.

Collecting by Grade

Some collectors want the highest graded coins. Others build lowball sets. Everyman sets often focus on attractive AU58 to low Mint State coins.

Date & Mintmark Sets

Traditional series collecting. This can include full runs, birth year sets, mint sets, and sets built around specific years or mints.

Mintmark Collecting

Collectors may focus on P, D, S, W, O, C, CC, or Dahlonega issues depending on their interests. West Point and Carson City are especially popular.

Toning & Eye Appeal

Visual beauty is the goal here: natural color, luster, and standout appearance.

Varieties & Errors

Variety collectors chase die differences like overdates or doubled dies, while error collectors pursue mint-made mistakes like off-centers or wrong planchets.

Counterstamps & Themes

Some collectors focus on counterstamps, gold only, CAC coins, specific denominations, or other niche themes. The possibilities are endless.

Collector insight: Most collectors do not stay in just one lane. It is common to start with pocket change, move into type or series collecting, and then branch into quality, toning, CAC, or specialized niches over time.

Quality Within the Grade

CAC, CACG, and Sticker Meaning

CAC & CACG

CAC evaluates already graded coins and helps identify whether they are low-end, solid, or high-end for the assigned grade. Many collectors think of that range as A, B, and C quality. CACG takes that philosophy into full grading.

It is important to remember that many high-quality coins have never been through CAC or CACG at all, so there are still plenty of unstickered A and B coins in the market.

Green vs Gold CAC

A green CAC sticker means the coin is solid or high-end for the grade. These are very desirable and, depending on the series, can increase value significantly. A gold sticker means the coin is likely undergraded and may belong in the next grade up.

Gold CAC coins are extremely popular across all series and grades and are rare enough that they form a specialty area of collecting on their own.

Market

Greysheet, Auction Prices, and Selling

Greysheet is one of the most important dealer pricing tools in the hobby because it reflects wholesale market levels rather than simple retail asking prices. That helps explain the spread between what a dealer might pay, what they might ask, and where the market is actually trading.

Auction records are also one of the best real-world references because they show what collectors actually paid for similar coins. Combining Greysheet, auction results, and dealer offers gives you a much stronger sense of real value before you buy or sell.