Preserving Your Strike Doubling on Edge Lettered Coins: A Conservationist’s Guide

Understanding Edge Lettering and Strike Doubling

As a conservationist, I’ve seen too many valuable pieces ruined by improper cleaning or storage. Here is how to keep this safe for the next generation.

Historical Significance of Edge Lettering

Edge lettering on coins represents a fascinating intersection of minting technology and artistic expression. The process involves rolling designs onto the edge of coins under pressure, creating a unique challenge for preservation. Unlike traditional surface strikes, edge lettering requires special consideration due to its three-dimensional nature and vulnerability to environmental factors.

Identifying Key Markers of Edge Lettering

When examining edge lettering for strike doubling, look for these specific characteristics:

• Partial lettering that may indicate the coin got stuck in the Castaing machine
• Double impressions where the coin went through the machine twice
• Missing lettering sections from mechanical issues

The pressure applied during the edge lettering process creates a unique environment where traditional strike doubling mechanisms may or may not apply. Understanding these nuances is crucial for proper preservation.

Proper Storage Solutions

Storage is perhaps the most critical aspect of preserving edge-lettered coins. Here are essential guidelines:

Avoiding PVC Damage

PVC (polyvinyl chloride) can cause severe damage to coins over time. The plasticizer in PVC can leach out and create a greenish slime that permanently damages the coin’s surface. Always use PVC-free holders for your edge-lettered coins.

Choosing the Right Holders

For edge-lettered coins, consider these options:

• Airtight capsules that protect from environmental contaminants
• Archival-quality flips made from polyester or Mylar
• Hard plastic holders that prevent physical contact

Environmental Controls

Temperature and humidity control are vital:

• Maintain consistent temperature (ideally 65-70°F)
• Control humidity (45-55% relative humidity is optimal)
• Avoid direct sunlight and fluorescent lighting

Toning and Oxidation Management

Toning can be both a blessing and a curse for edge-lettered coins. While some collectors appreciate natural toning, others prefer pristine surfaces. Here’s how to manage it:

Understanding Toning Patterns

Edge lettering can develop unique toning patterns due to the different metal exposure during the minting process. The pressure applied during edge lettering can affect how toning develops over time.

Preventing Unwanted Oxidation

To prevent unwanted oxidation:

• Use silica gel packets in storage containers
• Consider using Intercept Technology products
• Regularly inspect coins for signs of deterioration

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

This is perhaps the most controversial topic in coin preservation. As a conservationist, I strongly advise against cleaning most coins, especially those with edge lettering. Here’s why:

Risks of Cleaning

Cleaning can:

• Remove the natural patina that develops over time
• Scratch the delicate surfaces of edge lettering
• Potentially reduce the coin’s numismatic value

When Cleaning Might Be Necessary

In rare cases where cleaning is absolutely necessary (such as removing PVC residue), use only:

• Distilled water
• Non-abrasive, pH-neutral cleaners
• Microfiber cloths

Always consult a professional before attempting any cleaning.

Documenting and Monitoring Your Collection

Proper documentation is essential for preservation:

Creating a Preservation Log

Document:

• Acquisition date and source
• Current condition with detailed photographs
• Storage location and method
• Any conservation work performed

Regular Monitoring

Establish a schedule for inspecting your collection:

• Check for signs of toning or oxidation
• Ensure holders remain intact
• Verify environmental conditions remain stable

Special Considerations for Modern Edge-Lettered Coins

Modern minting techniques, such as those used for Presidential dollars, present unique preservation challenges:

Understanding Modern Production Methods

Modern edge lettering is often applied using different methods than traditional Castaing machines. This can affect how the coins age and what preservation methods are most effective.

Handling Mint Errors

Mint errors involving edge lettering require special attention:

• Improperly spaced lettering
• Missing edge lettering
• Partial edge lettering

These errors can be particularly susceptible to further damage due to their already compromised state.

Conclusion: Preserving History for Future Generations

The preservation of edge-lettered coins, particularly those with strike doubling or other minting anomalies, is a responsibility we bear as collectors and historians. By understanding the unique challenges these coins present and implementing proper preservation techniques, we ensure that these pieces of history remain intact for future generations to study and appreciate.

Remember, the goal of preservation is not just to maintain the coin’s physical condition, but to protect its historical significance and numismatic value. Whether you’re dealing with a modern Presidential dollar or a classic silver dollar, the principles of proper storage, careful handling, and informed conservation remain the same.

As we’ve seen from the discussions about strike doubling on edge lettering, there’s still much to learn about these fascinating minting anomalies. By preserving these coins properly, we contribute to the ongoing study and understanding of numismatics as a whole.

Take the time to implement these preservation strategies, and you’ll be rewarded with a collection that not only maintains its value but also serves as a testament to the art and science of coin minting throughout history.

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