Grading PCGS Plus (+) Coins with CAC Stickers: How to Spot the Difference Between a Solid Collectible and a Six-Figure Gem

Condition Is Everything: Reading the True Grade of a Plus-Graded CAC Coin

Condition is everything. I have spent decades behind a loupe, and I can tell you that the difference between a standard graded coin and one that earns both a PCGS Plus (+) designation and a Certified Acceptance Corporation (CAC) sticker can mean the difference between a $100 coin and a $10,000 coin — or even more. The collecting community is fascinated by these premium designations. When a coin clears the hurdle into plus territory and then earns the CAC imprimatur, it has proven its mettle in the most rigorous arena of numismatics.

In this guide, I will walk you through exactly what separates a run-of-the-mill graded coin from one that commands top dollar, using real-world examples that have captivated collectors like us.

Understanding the PCGS Plus Scale: Where the Plus Really Matters

The PCGS Plus system was introduced to differentiate coins that sit at the upper end of a given grade. A coin graded MS65 is not simply MS65 anymore — it could be a borderline MS65 that looks more like an MS64, or it could be a coin with the eye appeal, luster, and strike quality of an MS66. The Plus designation captures that upper echelon. But what exactly does it take to earn that little “+” symbol in the holder?

From my experience evaluating thousands of coins, the answer lies in three critical factors: luster consistency, strike quality, and eye appeal. A coin that receives a Plus grade typically exhibits these characteristics:

• Full, original mint luster that covers the majority of the high points without significant friction marks or hazing.
• A sharp, complete strike that brings up the major design elements — think the hair strands on a Morgan dollar, the feathers on a Standing Liberty quarter, or the horn details on a Buffalo nickel.
• Minimal contact marks that are not distracting when the coin is viewed at arm’s length, particularly in the focal points of the design.
• Attractive toning that enhances rather than detracts from the coin’s visual presentation.

Consider the collector who shared their 1937 Proof Buffalo nickel with a Gold CAC sticker — one of the finest examples of that date color-wise. As I noted in response, it is “ridiculously hard to find nice Proofs from this era that don’t have the common blue/green hazy toning, but rather deep electric reds, yellows, oranges, blues, and greens.” That level of color preservation alone pushes a coin into Plus territory, but when combined with a flawless strike and mirror-like proof fields, it becomes a genuinely rare variety.

The CAC Sticker: What Certified Acceptance Corporation Is Actually Looking For

If the PCGS Plus designation tells you a coin is at the top of its grade, the CAC sticker tells you it is at the top of its grade and that a second team of expert graders agrees — or, more accurately, that they believe the coin may even be undergraded.

CAC was founded in 2007 with a simple but controversial mission: to review already-graded coins and approve those that deserve a higher grade or represent the finest quality within their assigned grade. When a coin receives a CAC sticker, it means CAC’s panel of graders has examined it and determined that it is a solid, high-end example of its grade — or better.

What makes CAC’s process so valuable? Consider this: a coin might receive a PCGS MS64+ designation, but when it arrives at CAC, the graders may notice friction on the cheek that PCGS missed, or they may find that the luster, while present, is not as pervasive as required for the Plus threshold. The CAC sticker is essentially a vote of confidence from an independent third party.

As one collector noted in the forum discussion, “I had one PCGS + coin fail, all of my NGC + graded coins passed, go figure.” This highlights an important reality: the Plus designation is not a guarantee of CAC approval. Many Plus-graded coins do not receive CAC stickers, and this divergence is precisely what makes collecting these pieces so intellectually stimulating.

Wear Patterns: Reading the High Points Like a Professional

Wear analysis is the cornerstone of coin grading, and when you are evaluating whether a coin deserves a Plus designation, your scrutiny of wear patterns intensifies dramatically. At the MS64 to MS65 boundary — where many Plus coins reside — the difference between grades can be measured in fractions of a millimeter of metal loss.

Here is what I look for when examining high points for wear:

1. High-point contact locations: On a Morgan dollar, this means the hair above Liberty’s ear, the top of the cheek, and the highest points of the hair above the forehead. On a Saint-Gaudens double eagle, it is the cheek of Liberty and the top of the torch flame. Any softness at these locations immediately disqualifies a coin from a Plus grade.
2. Friction marks versus mint marks: It is critical to distinguish between original mint friction and post-mint contact marks that indicate the coin has been handled. Friction on the high points of a gold coin’s cheek is a grade-reducer.
3. Field reflectivity: I examine the fields under direct lighting to check for hazing, bag marks, or friction that would disrupt the reflective quality expected at the Plus level.

A striking example from the forum was the 1814 E/A quarter, which one collector described as “probably the best struck reverse I have ever seen on an E/A.” The collector noted that “almost all of them have a flatly struck head and wing on the eagle,” making this particular example exceptional. When strike quality is this strong, it elevates the coin significantly, even at a grade like MS63+. The absence of softness on the eagle’s wing feathers and the eagle’s head means the coin’s design elements are fully brought up — a hallmark of a Plus-quality strike.

Luster and Eye Appeal: The Visual Premium That Commands Higher Prices

If strike quality is the skeleton of a coin’s grade, luster is its skin — and for Plus-graded coins, the skin must be flawless. Luster is the reflective quality imparted by the minting process, and it is the first thing I notice when I pick up a coin.

For a coin to earn a Plus designation, the luster must be complete, uninterrupted, and visually appealing. Here are the specific luster characteristics I evaluate:

• Coverage: Does the original mint luster cover all major surfaces, or are there areas of dullness, friction, or cleaned surfaces? A Plus coin must have luster that extends to the focal points of the design.
• Quality of reflection: When I tilt the coin under a light source, I look for the characteristic “cartwheel” effect seen on uncirculated silver and gold coins. The luster should be vibrant and dynamic, not dead or flat.
• Toning and patina: While toning is subjective, CAC and the market at large favor natural, attractive patina. The 1937 Proof Buffalo nickel mentioned earlier is a perfect example — its “deep electric reds, yellows, oranges, blues, and greens” represent the holy grail of Proof nickel toning, and this color quality was a significant factor in its Gold CAC approval.

Eye appeal is the umbrella term that encompasses luster, toning, strike, and overall visual presentation. It is the intangible quality that makes a collector say, “I have to have that coin.” In the competitive world of Plus-graded coins, eye appeal is often the tiebreaker between two coins of identical technical grades.

Strike Quality: Where Plus Grades Live or Die

Strike quality is arguably the most misunderstood aspect of coin grading. Many collectors confuse a strong strike with a high grade, but the two are not synonymous. A coin can be fully struck and still be low-grade due to wear or marks. However, when evaluating coins for Plus designation, strike quality becomes a critical differentiator.

A coin with a weak strike will show incomplete detail at the centers of the design — the points furthest from the dies. On a Standing Liberty quarter, this means the hair below Liberty’s chin and the branches in her hand may appear flat. On a Walking Liberty half dollar, the center of the flag and the branches may not be fully brought up. These weaknesses are visible at any grade, but they are particularly disqualifying for Plus consideration because they indicate the coin did not receive full mint-state preservation of its design.

The forum discussion highlighted the 1814 E/A quarter as an exceptional strike example, but it is worth noting that strike quality varies enormously by date and mint. Some coins, by their very nature, are harder to strike well. The 1814 E/A, with its complicated reverse design featuring the “E PLURIBUS UNUM” banner and the eagle’s detailed plumage, is a notorious strikemaker. When you find one with a fully struck reverse, you have found something special — and that special quality is exactly what the Plus designation and CAC sticker are designed to capture.

Gold CAC Stickers: The Ultimate Undergrading Indicator

Among the most coveted designations in modern numismatics is the Gold CAC sticker. Unlike the standard green CAC sticker, which indicates that CAC agrees with the assigned grade, the Gold CAC sticker signifies that CAC believes the coin is undergraded — that it would merit a higher grade if re-submitted to PCGS or NGC.

As one forum member correctly observed, “in CAC’s conservative opinion the coin is typically undergraded by roughly 1.5 grades.” This means that a coin receiving a Gold CAC sticker at MS64+ is likely an MS66 or better in terms of its actual eye appeal and technical quality. It is no surprise, then, that the vast majority of Gold CAC stickers appear on coins graded 64 or below, with 65 being a rare exception.

When a collector posts a PR66+ with Gold CAC — as one forum member did with their 1937 Proof Buffalo nickel — the numismatic community takes notice. This is an extraordinary coin. At PR66+, it is already in the top tier of its grade, and the Gold CAC sticker confirms that it is likely a PR67 or even finer. For the 1937 Proof Buffalo nickel specifically, a coin with deep, vibrant color and a flawless proof strike at this level is essentially a rare variety.

Another remarkable example discussed in the forum was the J-54 2-Cent Pattern, graded PF64+ RB with CAC. This coin’s provenance — ex-Bob Simpson, previously from the Pittman Collection (purchased by J.J. Pittman for $55 from Abe Kosoff’s 1958 ANA Convention sale) and later offered in the Heritage June 2005 Long Beach sale — makes it a piece of numismatic history. The fact that it earned both a Plus designation and a CAC sticker confirms that it is one of the finest known examples of this extremely rare variety. Its provenance and condition combine to give it immense numismatic value.

Practical Takeaways for Collectors and Investors

So what does all of this mean for you as a collector or investor? Here are my actionable takeaways based on years of grading experience and the collective wisdom of the collecting community:

1. Not All Plus Coins Are Created Equal

A PCGS MS64+ coin that does not carry a CAC sticker may simply be a coin that sits at the lower boundary of the Plus range. A PCGS MS64+ with CAC, on the other hand, has been independently verified as a high-end example of that grade. The price difference between the two can be substantial — often 20% to 50% or more. For collectors seeking mint condition representatives, the CAC sticker is the definitive marker of collectibility.

2. Gold CAC Stickers Are Rare and Valuable

If you encounter a coin with a Gold CAC sticker, especially one graded below MS65, treat it with the respect it deserves. These coins are likely significantly undergraded and represent exceptional value for the discerning buyer.

3. Examine the High Points First

Related Resources

You might also find these related articles helpful:

• Inherited a “Rare Error” 2020 Quarter? What You Need to Know Before Selling Your Estate Finds – If You Inherited This Piece, Your First Instinct Might Be to Panic If you inherited this piece, your first instinct migh…
• Is Your PCGS Plus Grade Coin with a CAC Sticker Real? The Ultimate Authentication Guide – Introduction: The Collector’s Holy Grail and the Counterfeiter’s Target Counterfeits are flooding the market…
• Is the 2020-W Quarter with a Roosevelt Reverse a Good Long-Term Investment? An Alternative Asset Manager’s Analysis of Error Coins, Liquidity, and ROI – Introduction: The Hard Asset Hook I’ve spent years building my personal collection and advising others on hard ass…