If you're new to collecting and the terms "PCGS MS65" or "NGC XF45 CAC" mean nothing to you yet, this page is for you. Certification is the foundation of how coins are bought and sold at any serious level — understanding it will make every listing on this site (and any other) make immediate sense.
What certification is
A certified coin has been authenticated and graded by a professional third-party service — primarily PCGS (Professional Coin Grading Service, founded 1986) or NGC (Numismatic Guaranty Company, also 1987). The coin is examined by multiple graders, assigned a numeric grade on the Sheldon 70-point scale, and sealed in a tamper-evident plastic holder — called a slab — along with the grade, attribution, and a barcode that ties it to a registry entry the grading service maintains permanently.
PCGS and NGC are the two services whose slabs carry liquidity in the market. A coin in a genuine PCGS or NGC holder sells faster and at better prices than an otherwise identical raw coin because the buyer doesn't have to make their own authenticity and grade call. That convenience is real and it has dollar value.
CACG (CAC Grading) is newer — founded by the same team behind the Certified Acceptance Corporation — and builds CAC-level standards directly into the grading process. CACG holders are increasingly accepted at the same level as PCGS and NGC in the market for early American coinage, which is where we focus.
The Sheldon scale
William Sheldon published a numerical grading scale for large cents in 1949. It originally had an economic component (a cent worth one cent in Poor condition was worth 70 cents in MS-70) that turned out to be wrong, but the scale stuck and became the universal language of American numismatics.
The scale runs 1–70 and divides cleanly into two families:
| Grade | Abbreviation | What to expect |
|---|---|---|
| Poor | P-1 | Identifiable type and date, nothing more. Heavily worn. |
| Fair / About Good | FR-2 / AG-3 | Barely more than the outline. Date and major devices visible. |
| Good | G-4 to G-6 | Major design clear; rims may be flat into the legend. |
| Very Good | VG-8 to VG-10 | Design clear with some detail; rims usually complete. |
| Fine | F-12 to F-15 | Moderate even wear; all major features sharp. |
| Very Fine | VF-20 to VF-35 | Light-to-moderate wear on the high points; letters clear. |
| Extremely Fine | XF-40 / EF-45 | Slight wear on the very highest points only; nearly all mint luster visible. |
| About Uncirculated | AU-50 to AU-58 | Trace wear at the very summit; much of the original luster remains. |
| Mint State | MS-60 to MS-70 | No wear whatsoever. Grades within this range reflect quality of strike and luster and number of contact marks. |
| Proof | PR-60 to PR-70 | Specially struck for collectors (mirrored fields, frosted devices). Same 60–70 scale, prefix PR or PF. |
In practice, the difference between an MS-63 and an MS-65 example of the same coin can be a 5–10× price gap. That's not arbitrary — MS-65 means far fewer contact marks, better luster, and sharper strike. Two coins can look very similar in a photo and be a grade apart; that's exactly why human experts examining the coin in hand are the standard.
Why authenticity is the bigger deal
Grade matters. Authenticity matters more. A MS-66 coin that isn't genuine is worth nothing. A F-12 coin that is genuine is worth exactly what the market says a F-12 is worth.
Counterfeit American coins have gotten remarkably sophisticated. Chinese fakes of Morgan dollars, Bust half dollars, and Walking Liberty halves now routinely pass casual visual inspection — the right weight, the right diameter, the right general feel. The only reliable mass authentication is the suite PCGS and NGC run: weight to the milligram, metal composition (sometimes by XRF), die axis, device depth, strike characteristics, edge reeding count. That takes real equipment and trained eyes who've held tens of thousands of genuine examples.
When you buy a coin in a genuine PCGS or NGC holder, you are buying the result of that process. The grading service stands behind it. We stand behind it on top of that. A raw coin — even from a dealer you trust, even from a show you attend in person — carries authenticity risk that a certified coin simply doesn't.
What CAC adds
The Certified Acceptance Corporation was founded by John Albanese — one of the founders of NGC — in 2007. The problem CAC set out to solve: grading is an inherently subjective process run by humans, so not every MS-64 is the same MS-64. The bottom of the MS-64 range looks very different from the top. Market participants knew this, but communicating it required adjectives: "a great 64," "an 64+ quality coin." CAC turned that into a sticker.
A green CAC sticker means an independent CAC examiner re-looked at the coin and agrees it's solid for its grade — at the high end of what that grade looks like, not just adequate. A gold stickermeans the CAC examiner thinks the coin is quality for the next grade up (an upgrade candidate). Coins that don't get a sticker either weren't submitted or didn't meet the standard — but absence of a sticker doesn't mean a coin is problem-free; it just means you don't have the extra layer of confirmation.
CACG (CAC Grading, launched 2023) is CAC's own slab service. Instead of stickering existing PCGS/NGC holders, CACG grades the coin from scratch under CAC-level standards and seals it in a CACG holder. Market acceptance has been strong in the early American series — collector-quality copper and silver especially.
What "original surfaces" means
You'll see this phrase in serious listings, including ours. Coin surfaces can be — and frequently are — artificially altered: cleaned to look brighter, whizzed (wire-brushed to simulate luster), or chemically dipped to remove toning. PCGS and NGC note these problems on the holder itself: "Cleaned," "Details," or "Genuine." A Details-graded coin trades at a significant discount to a problem-free coin in the same grade. The market has priced this in.
Original surfaces — untouched since the mint, with whatever toning or wear time produced — are what serious collectors want. The grading services grade problem-free coins on the numeric scale; coins with problems get a "Details" designation that marks the problem. Snowpack only sells problem-free coins in the numeric grades.
Should you ever crack a slab?
Occasionally, yes — if you want to resubmit for a potential grade upgrade, or if the coin's population is such that a higher grade would dramatically change the value and you have specific reason to think it qualifies. But casually, no. Once a coin is out of its original holder:
- The grading service's authenticity guarantee ends. They guaranteed the coin in that holder; they can't guarantee what happened to it since.
- Selling it becomes harder — buyers now have to make their own grade call, and they'll either pass or discount.
- The coin's provenance as a slabbed example is permanently gone. For some coins with interesting registry or pop report context, that history has real value.
The standard advice: if you crack a coin, have a plan for what happens next. Don't crack on impulse.
A note on price guides
PCGS CoinFacts and NGC Price Guide both publish current retail estimates by grade. These are useful reference points, not gospel — realized prices at Heritage and Stack's Bowers and Great Collections reflect what coins actually trade for, and for anything interesting, the current population report (how many examples have been graded in that grade) matters a great deal. A coin with a pop of 3 at MS-65 is a different proposition from a coin with a pop of 3,000. The databases are free and worth learning.