Finding PCGS Grade Errors in the Wild: A Cherry Picker’s Guide

The Thrill of the Hunt

You don’t always need a dealer to find treasure. Sometimes the most valuable discoveries come from carefully examining coins in circulation, bulk lots, or estate sales. As a roll hunter, I’ve learned that patience and a sharp eye can uncover numismatic gems that others overlook.

The Case of the Mismatched Grades

Recently, a collector shared an intriguing story about three consecutive-year Canadian Platinum Maple Leaf Reverse Proof coins. All purchased directly from the Royal Canadian Mint, these coins were sent to PCGS for grading with surprising results: two coins graded PR70, but the 2024 issue came back as PR64. This massive 6-point difference in what should be identical coins raises important questions about the grading process.

Understanding the Grading Discrepancy

The collector examined all three coins side-by-side using both naked eye and a lighted loupe, finding no visible differences that would justify such a dramatic grade difference. The PCGS population report shows 22 total 2024 coins graded, with 19 at PF70, 2 at PF69, and this single outlier at PF64.

“The question is, has there been instances where PCGS errantly enters the grade into their database/system? That’s the only thing that makes sense to me.”

Common Grading Errors to Watch For

Several experienced collectors weighed in on this mystery, sharing stories of grading errors:

• Data entry mistakes where numbers are transposed or misread
• Mechanical errors during the grading process
• Miscommunication between graders and data entry personnel

One collector recalled a case where common Walking Liberty halves were accidentally graded MS68 instead of their actual MS65 or 66 grade due to a data input error. Another mentioned receiving two 1968-S proof half dollars that graded 3 points apart, later discovering a scrape on the lower-graded coin.

Identifying Potential Errors in Your Collection

When examining coins that seem misgraded, look for these telltale signs:

• Coins that appear visually identical but received vastly different grades
• Outliers in population reports that don’t match visual quality
• Discrepancies between certified grades and apparent condition

In this case, experienced collectors noted that a genuine PR64 would show visible marks without magnification, which none of the observers could detect on the 2024 coin.

What to Do If You Suspect an Error

If you believe you’ve found a grading error, consider these steps:

1. Contact the grading service directly with your concerns
2. Provide clear photographs and certification numbers
3. Request a review of the grading process
4. Be prepared for skepticism – grading services hear many claims

Some collectors recommend digital contact over phone calls, as you can include images to support your case. However, be aware that grading services may require you to pay for reconsideration even if an error is found.

The Value of Persistence

The value difference between a PR64 and PR69/70 can be substantial, making it worth investigating potential errors. In this case, the collector planned to contact PCGS for reconsideration, though the outcome remained uncertain.

Lessons for Cherry Pickers

This case offers valuable lessons for collectors who enjoy searching through bulk lots and estate sales:

• Always compare similar coins side-by-side when possible
• Trust your eyes – if something looks wrong, investigate further
• Document your findings with clear photographs
• Don’t be afraid to question established grades when evidence suggests an error

Conclusion

While grading errors are relatively rare, they do occur and can represent significant opportunities for knowledgeable collectors. The story of these Canadian Platinum Maple Leaf coins demonstrates that even modern, high-quality coins can be subject to grading inconsistencies. Whether you’re searching through rolls, bulk lots, or estate sales, maintaining a critical eye and understanding the grading process can help you identify potential errors and undervalued coins. Remember, the most valuable finds often come from careful observation and the willingness to question what others might accept at face value.

Related Resources

You might also find these related articles helpful:

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