Preserving Your 1957-D Lincoln Cent RPM: Expert Conservation Tips

Understanding the 1957-D Lincoln Cent RPM

As a conservationist, I’ve witnessed countless valuable coins deteriorate due to improper handling and storage. The 1957-D Lincoln Cent RPM (Repunched Mintmark) is a fascinating variety that deserves proper preservation techniques to maintain its numismatic value for future generations.

Historical Significance of the 1957-D RPM

The 1957-D Lincoln Cent RPM represents an interesting chapter in minting history. During this era, mintmark punches were often applied by hand, leading to varieties where the “D” mintmark from the Denver facility shows evidence of multiple punching. This creates a collectible variety that enthusiasts actively seek in mint condition.

The Importance of Proper Storage

I’ve seen too many valuable pieces ruined by improper cleaning or storage. Here’s how to keep this rare variety safe for the next generation.

Avoiding PVC Damage

Polyvinyl chloride (PVC) is one of the greatest threats to coin preservation. PVC-containing flips and holders can release acidic gases that cause irreversible damage to coins, creating a distinctive greenish slime that permanently etches the surface. For your 1957-D RPM, always use PVC-free holders made from inert materials like polyethylene or mylar to preserve the coin’s original luster.

Understanding Toning and Oxidation

Natural toning on copper coins like the Lincoln cent is a double-edged sword. While attractive, even toning can enhance a coin’s eye appeal and value, improper toning or oxidation can significantly diminish it. The 1957-D cent, being over 65 years old, has likely developed some toning. This natural patina actually helps protect the coin’s surface from further degradation and contributes to its collectibility.

To Clean or Not to Clean: The Conservationist’s Perspective

The Risks of Improper Cleaning

One of the most common mistakes I see is collectors attempting to clean their coins. Cleaning a 1957-D RPM can dramatically reduce its value – sometimes by 90% or more. The abrasive action removes the natural patina and microscopic surface details that collectors value. Even gentle cleaning solutions can strip away the original mint luster that makes these coins desirable in the marketplace.

Proper Handling Techniques

When examining your 1957-D RPM, always hold it by the edges to prevent oils from your fingers from transferring to the coin’s surface. These oils can accelerate tarnishing and create fingerprint impressions that are difficult to remove. Consider wearing cotton gloves when handling particularly valuable specimens to preserve their pristine condition.

Identifying Key Markers for the 1957-D RPM

Die States and Their Significance

The forum discussion highlights an important aspect of variety collecting – die states. As noted by experienced collectors, the “stages” referred to by VarietyVista represent different die states of the same variety. For the 1957-D RPM, these stages are primarily distinguished by the presence and severity of die cracks, particularly at Lincoln’s shoulder, which affects the coin’s overall strike quality.

Die Crack Progression

Early die states (Stage A) show no die cracks, while later stages progress from light to heavy die cracks. As one collector noted, “The die crack surely is one giveaway” when determining die state. However, as another experienced collector pointed out, “Generally speaking, a tiny die crack like that on a Lincoln cent would not matter to most collectors, nor would it make a difference to the market value of the variety.”

Proper Storage Solutions

Choosing the Right Holders

For long-term preservation of your 1957-D RPM, consider these storage options:

• Air-tite capsules for individual coins to maintain mint condition
• Acid-free cardboard holders with mylar windows
• Archival-quality coin albums with proper interleaving
• Temperature and humidity-controlled storage environments

Environmental Considerations

Coins are particularly sensitive to environmental conditions. Store your 1957-D RPM collection in a cool, dry place away from direct sunlight. Ideal conditions include temperatures between 60-70°F and relative humidity between 40-50%. Avoid basements and attics where temperature and humidity fluctuate dramatically, as this can affect the coin’s patina and overall eye appeal.

Authentication and Grading

Professional Authentication

For valuable specimens, consider professional authentication from services like NGC or PCGS. These services not only verify authenticity but encapsulate coins in inert holders that provide optimal long-term protection. The forum references both VarietyVista and NGC VP as resources for identifying this specific variety and determining its true numismatic value.

Understanding Market Value

As discussed in the forum, die state generally has minimal impact on market value for most Lincoln cent varieties. However, early die states are typically scarcer, comprising only 15-20% of total production. While this scarcity might appeal to variety specialists, it rarely translates to significant price premiums for the 1957-D RPM in the current collector marketplace.

Conclusion: Preserving History for Future Generations

The 1957-D Lincoln Cent RPM represents more than just a collectible coin – it’s a piece of minting history that deserves proper preservation. By following these conservation principles – avoiding cleaning, using proper holders, controlling environmental conditions, and handling with care – you can ensure this variety remains in excellent condition for future collectors to appreciate.

Remember that the natural patina and original surfaces of your coin are part of its historical character. As a conservationist, my primary recommendation is always: when in doubt, do nothing. The best preservation is often preventing damage rather than attempting to reverse it.

“The reason they show different die stages is small features like mintmarks and remnants of them can change shape a little over time. Look at the overall appearance of the obverse and ask yourself is this a relatively new die or a beat up die? The die crack surely is one giveaway.” – Experienced Collector

By respecting the coin’s original state and providing appropriate storage conditions, your 1957-D Lincoln Cent RPM can remain a valuable and historically significant piece for generations to come.

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