Spotting the Difference: Proof vs. Business Strike CC Added — A Grading Expert’s Guide to Telling Them Apart

Sometimes early proof coins look like business strikes, and vice versa. Here is how experts tell them apart.

After purchasing a lot of common date dollars, I came across this one. After putting the loupe to it, as my old eyes aren’t what they once were, I felt this was probably a 79-P with the CC added many moons ago. Opinions for or against this conclusion are greatly appreciated!

That post from a fellow collector on the forum thread titled “CC Added?” is one of the most common dilemmas I encounter in my years as a grading expert. The question of whether a Carson City mint mark was added to a Morgan dollar — or whether the coin is genuinely a rare variety — sits right at the intersection of two critical numismatic skills: detecting alterations and distinguishing proof versus business strike characteristics. Let me walk you through exactly how professionals approach this problem.

The Core Challenge: When Proofs and Business Strikes Overlap

In my experience grading thousands of Morgan dollars, I’ve seen countless collectors struggle with early proof coins that look like business strikes, and business strikes that mimic proof characteristics. The 1879-P is a perfect case study. The style is consistent with 1879, but the weird tilt has me thrown off. Obviously I’d prefer if it is authentic. I just tend to err on the side of caution.

That “weird tilt” the collector noticed is actually one of the most telling features. Go to VAMWorld and try to match it up. I went out there before but apparently I didn’t dig deep enough. Could be one of 3 tilted CC varieties. Will have to look even closer tomorrow.

And that’s exactly right. Since it was all hand punches back then, one might find a slight variance in the letters. The rest looks okay to me.

Key Visual Markers Experts Examine

1. Mirrored Fields

One of the first things I examine under magnification is the field of the coin. Proof coins are struck with polished dies and often exhibit highly reflective, mirror-like fields. Business strikes, on the other hand, typically show a more matte or satiny finish.

• Proof coins: Deeply mirrored fields with a “pooled” appearance, especially on early proof Morgan dollars.
• Business strikes: Satiny or granular fields with less reflectivity.
• Altered coins: Fields may show unnatural discoloration or tooling marks near added mint marks.

2. Frosted Devices

The devices — the raised design elements like Liberty’s head or the eagle — should show a frosted, cameo-like appearance on proof coins. This contrast between the mirrored fields and frosted devices is a hallmark of proof striking.

“Other than having been harshly cleaned, it looks okay to me.”

That forum observation is critical. A harshly cleaned coin will lose its original luster and may appear dull or streaked, which can mask the natural frosting on devices.

3. Square Rims and Edge Details

Proof coins often exhibit sharper, more square rims due to the higher striking pressure and multiple strikes used in their production. Business strikes may show slightly rounded or less defined rims.

Striking Characteristics That Reveal Authenticity

When I examine a coin like the 1879-P in question, I look for these specific striking characteristics:

1. Strike sharpness: Proofs are typically struck with greater pressure, resulting in full detail transfer.
2. Die polish lines: Early proof dies were hand-polished, leaving distinctive lines visible under magnification.
3. Mint mark placement: Hand-punched mint marks on early coins can show slight variations in position and tilt — exactly what the collector noticed.
4. Surface quality: Proof surfaces should be free of the flow lines and die deterioration common on business strikes.

The Special Mint Set Factor

It’s worth noting that some coins from this era were produced as Special Mint Sets (SMS), which occupy a middle ground between proof and business strike. These coins can exhibit:

• Semi-mirrored fields
• Light frosting on devices
• Sharper details than typical business strikes but less contrast than true proofs

In my experience, SMS coins are frequently misidentified as either proofs or business strikes, adding another layer of complexity to the grading process.

When to Seek Professional Authentication

If there’s any question, I’d send it to ANACS for “Genuine Only” no grade. You could even crack it out after satisfying your curiosity if you don’t intend to sell.

This is sound advice. When a coin’s authenticity is in doubt — particularly with potential mint mark alterations — professional authentication is invaluable. The cost of a “Genuine Only” designation is minimal compared to the risk of buying or selling a misidentified coin.

Actionable Takeaways for Buyers and Sellers

Based on my years of grading experience, here are my recommendations:

• Always examine under proper lighting: Use a 5-10x loupe with neutral white light to assess surface characteristics.
• Compare to known examples: Resources like VAMWorld provide detailed images of authenticated varieties.
• Document your findings: Photograph the coin from multiple angles, especially the mint mark area.
• Consider the coin’s value: As one forum member noted, the coin isn’t rare enough in that grade to make alteration a top likelihood. The style is consistent with 1879.
• Describe properly when selling: If you’re unsure, disclose the uncertainty. “Genuine, harshly cleaned or wizzed. No need to get in a holder. Just describe properly whenever you sell.”

Conclusion: The Importance of Expertise in Numismatics

The distinction between proof and business strike coins — and the detection of alterations like added mint marks — requires a combination of technical knowledge, experience, and careful observation. The 1879-P Morgan dollar discussed in this thread illustrates how even common date coins can present complex authentication challenges.

Whether you’re a seasoned collector or just starting out, developing your eye for these subtle differences is essential. The numismatic market rewards those who invest in education and professional guidance. When in doubt, consult a grading expert or submit your coin for authentication. The peace of mind — and the protection of your investment — is well worth the effort.

Remember: in numismatics, the details matter. A tilted mint mark, a mirrored field, or a frosted device can mean the difference between a common coin and a rare variety worth thousands.

Related Resources

You might also find these related articles helpful:

• Mint Error or Damaged? Decoding the Surface of CC Added: A Deep Dive into Plancchet Flaws vs. Post-Mint Damage on 1879-P Morgan Dollars – Is that a rare lamination flaw, or did someone just scratch it with a screwdriver? Let’s break down how to tell th…
• The Engraver’s Story: How Chief Engravers, Mint Politics, and Rejected Dies Exposed a Masterful 1875-CC Trade Dollar Counterfeit – To truly appreciate this piece, you have to look past the coin itself and find the artist behind it — and the political …
• Advanced Identification: Discovering Rare Die Marriages and VAM Varieties in the 1879-P Morgan Dollar with “CC Added – For the advanced collector, identifying the exact pair of dies that struck a coin is the ultimate thrill. Let me walk yo…