Buried Treasure: How Famous Shipwreck and Hoard Coins Survived Centuries Underground and Underwater — And What Collectors Need to Know Today

Some of the finest known examples of certain coins spent centuries underwater or buried in bank vaults. Let’s look at the hoard history.

As someone who has spent decades in the trenches of treasure salvage — from the ocean floor to the back rooms of estate sales — I can tell you that coins recovered from famous shipwrecks and hoards occupy a singular place in numismatics. They are not merely old metal. They are time capsules. They carry the weight of history, the drama of disaster, and the romance of rediscovery. And in today’s market, where collectors in states like Washington face a crushing 10.1% sales tax on coin purchases — on top of auction house buyer’s premiums that can exceed 22% — understanding the provenance and premium value of hoard coins has never been more important.

When you’re paying upwards of 30% over hammer price just to acquire a coin in a high-tax state, you’d better know exactly what you’re buying and why it’s worth it. Shipwreck and hoard coins often justify that premium in ways that ordinary retail pieces simply cannot. Let me walk you through the most famous discoveries, what they mean for collectors, and how to evaluate these extraordinary pieces.

The S.S. Central America: The Ship of Gold

No discussion of shipwreck numismatics is complete without the S.S. Central America, often called the “Ship of Gold.” This sidewheel steamer sank on September 12, 1857, roughly 160 miles off the Carolinas during a catastrophic hurricane. She was carrying a staggering cargo of gold — an estimated 4,700 to 6,000 twenty-dollar Liberty Head double eagles, along with gold bars, assayer ingots, and other coins — much of it destined for Eastern banks reeling from the Panic of 1857.

What Makes S.S. Central America Coins Special

I’ve examined several S.S. Central America double eagles over the years, and the first thing that strikes you is the quality. These coins were largely mint-state when they went down. Many were freshly struck at the San Francisco Mint in 1857 and were en route to New York. The deep ocean environment — cold temperatures, total darkness, and low oxygen levels at depth — essentially created a natural time capsule.

Key characteristics of S.S. Central America coins include:

• Exceptional preservation: Many specimens grade MS-63 through MS-66 by PCGS and NGC standards, with some even higher. For 1857-S double eagles, these rank among the finest known examples in existence.
• Distinctive toning: Sea-salvage gold coins often develop a characteristic toning or surface patina from prolonged saltwater exposure. This is not damage — it’s a hallmark of authenticity and provenance that experienced collectors actively seek.
• Recovery documentation: Coins from the S.S. Central America come with detailed recovery records. Tommy Thompson’s expedition in the late 1980s, and the subsequent legal battles and recoveries, have created a well-documented chain of custody that bolsters both authenticity and collectibility.
• Premium value: These coins routinely command significant premiums over non-shipwreck examples of the same date and grade. An 1857-S double eagle in MS-65 from the Central America might sell for multiples of what a non-provenance example would bring.

The Legal Drama Adds to the Legend

The S.S. Central America story isn’t just about treasure — it’s about legal battles that spanned decades. Tommy Thompson’s 1988 recovery was followed by years of litigation with insurance companies, investors, and eventually criminal charges against Thompson himself for defrauding investors. The legal saga only heightened the mystique of these coins and underscored the complex intersection of treasure salvage law, numismatics, and investment.

The Redfield Hoard: A Million Silver Dollars Hidden in a Basement

If the S.S. Central America represents the romance of the sea, the Redfield Hoard represents the quiet, obsessive passion of a single collector. LaVere Redfield, a reclusive Nevada millionaire, accumulated over 407,000 silver dollars — primarily Morgan and Peace dollars — over several decades, storing them in his Reno home. When he died in 1974, the hoard was discovered, and it remains one of the largest single accumulations of silver dollars ever found.

What the Redfield Hoard Tells Us About Hoard Coins

In my experience grading and evaluating hoard coins, the Redfield Hoard is a textbook case study. Here’s what collectors should understand:

• Storage conditions matter enormously: Redfield stored his dollars in bags, boxes, and even garbage cans in his basement. The result was a wide range of conditions — from pristine, untouched mint-state coins with full cartwheel luster to those with heavy bag marks, toning, and even some corrosion from moisture exposure. This variety means that Redfield Hoard coins span a broad price spectrum.
• Provenance adds value: Coins authenticated and certified as part of the Redfield Hoard carry a premium. PCGS and NGC both offer “Redfield” designations on their holders, and collectors actively seek these out for the added confidence in authenticity.
• Key dates still emerge: While the hoard was heavily composed of common-date Morgans (particularly from the Carson City Mint), it also contained scarcer dates and mint marks — rare variety examples previously thought to be uncommon in high grade. The hoard effectively reshaped the population reports for certain issues.
• The “hoard effect” on pricing: When 407,000 silver dollars hit the market simultaneously, it temporarily suppressed prices for common-date Morgans. This is a critical lesson for collectors: large hoards can depress the market for common dates while simultaneously elevating the prestige of certified, provenanced examples.

Lessons for Today’s Buyers

The Redfield Hoard teaches us that not all hoard coins are created equal. When evaluating any hoard coin, consider:

1. Is the coin certified with a provenance designation?
2. What were the storage conditions — dry basement, buried in soil, or submerged in seawater?
3. Does the coin exhibit any unique characteristics such as toning, patina, or surface quality attributable to its time in the hoard?
4. How does the current market for that date and grade compare to non-hoard examples?

The Saddle Ridge Hoard: A Modern-Day Gold Rush in the Backyard

In 2013, a couple walking their dog on their property in Northern California’s Gold Country stumbled upon something extraordinary: eight metal cans containing over 1,400 gold coins, dating from 1847 to 1894. The Saddle Ridge Hoard, as it came to be known, was valued at approximately $10 million and remains the largest known buried treasure find in U.S. history.

Why the Saddle Ridge Hoard Captured the World’s Imagination

What makes the Saddle Ridge Hoard so compelling is its accessibility. Unlike the S.S. Central America, which required millions of dollars in deep-sea salvage technology, or the Redfield Hoard, which was the product of one man’s decades-long obsession, the Saddle Ridge Hoard was found by ordinary people on their own land. It reignited the dream that treasure might be lurking just beneath the surface of everyday life.

Numismatically, the hoard was remarkable for several reasons:

• Exceptional grades: Many of the coins were in superb condition, with numerous specimens grading MS-65 and above. The burial environment — sealed metal cans in relatively dry soil — provided excellent protection, preserving original mint luster and sharp strike details.
• Date range: The coins spanned nearly five decades of U.S. gold coinage, including Liberty Head $20 double eagles, $10 eagles, and $5 half eagles. This gave collectors a cross-section of 19th-century American gold coinage in remarkable preservation.
• Mint diversity: Coins from multiple mints were represented, including Philadelphia, San Francisco, Carson City, and New Orleans, adding to the hoard’s numismatic significance and eye appeal.
• Market impact: The Saddle Ridge Hoard coins were sold through Amazon’s online marketplace in partnership with Kagin’s, the numismatic firm that authenticated and graded the hoard. This was a groundbreaking moment — treasure coins sold through a mainstream e-commerce platform, reaching an audience far beyond traditional numismatic circles.

The Saddle Ridge Hoard and the Sales Tax Question

Here’s where the forum discussion about Washington State’s 10.1% sales tax becomes directly relevant. When Saddle Ridge Hoard coins were sold online, buyers in states with sales tax on coins and bullion faced an immediate cost increase. For a coin selling at $5,000, that’s an additional $505 in Washington State alone. Add a buyer’s premium, and the total cost escalation becomes significant.

This is precisely why provenance matters so much. A Saddle Ridge Hoard coin isn’t just another 1880-S Morgan dollar. It’s a piece of a documented, authenticated treasure find with a unique story. That story justifies the premium — and it’s what makes the sales tax bite worth absorbing for serious collectors.

Shipwreck Effects: How the Ocean Changes Coins

As a treasure salvor, I’ve spent considerable time studying and handling sea salvage coins. The effects of prolonged submersion in saltwater are distinctive and, when properly understood, actually enhance a coin’s desirability and numismatic value.

Common Shipwreck Effects on Coins

Here’s what to look for when evaluating sea salvage coins:

• Surface texturing: Saltwater can create a fine, granular texture on a coin’s surface. This is different from corrosion — it’s more like a subtle frosting that gives the coin a unique appearance. Experienced graders recognize this as a shipwreck effect rather than damage.
• Toning and patina: Shipwreck gold coins often develop a rich, warm toning that ranges from deep gold to reddish or even purplish hues. Silver coins may exhibit rainbow toning or a soft gray patina. These toning patterns are impossible to fake convincingly and serve as a natural authentication marker that boosts collectibility.
• Encrustation: Some shipwreck coins are found with marine encrustation — layers of calcium, coral, and other ocean deposits. Professional conservation can carefully remove this encrustation to reveal the coin beneath, but many collectors prefer to leave it partially intact as evidence of the coin’s underwater journey.
• Edge and rim variations: Prolonged exposure to sand and sediment can create subtle wear patterns on edges and rims that differ from circulation wear. This is an important diagnostic feature for authentication.

Grading Sea Salvage Coins

Both PCGS and NGC have developed specific protocols for grading shipwreck coins. These coins are often designated with special labels — such as “Shipwreck Effect” or “SS Central America” — that document their provenance and condition. In my experience, these designations add meaningful value, often 20% to 50% or more over non-shipwreck examples of the same date, mint, and technical grade.

The key is that shipwreck coins are graded on a different scale than circulation coins. A shipwreck coin with minor surface texturing but exceptional overall detail and remaining luster might grade higher than you’d expect, because the grading services account for the unique environmental factors.

Sea Salvage Coins: Authentication and Market Value

The market for sea salvage coins has matured significantly over the past three decades. What was once a niche area of collecting has become a major segment of the numismatic market, driven by high-profile recoveries and increased public awareness.

Major Shipwreck Coin Sources

Beyond the S.S. Central America, collectors should be aware of these significant shipwreck coin sources:

• Nuestra Señora de Atocha (1622): This Spanish galleon, discovered by Mel Fisher off the Florida Keys in 1985, yielded thousands of silver coins (reales), gold coins (escudos), and bars. Atocha coins are among the most recognizable and collectible shipwreck coins in the world.
• SS Republic (1865): This steamship sank off the coast of Georgia carrying a cargo of gold and silver coins destined for post-Civil War commerce. Odyssey Marine Exploration’s recovery in 2003 brought thousands of coins to market, many in exceptional condition with strong eye appeal.
• SS Gairsoppa (1941): A British merchant vessel sunk by a German U-boat during World War II, carrying a large cargo of silver bullion. The recovery by Odyssey Marine Exploration in 2011 was one of the deepest and most technically challenging salvage operations ever conducted.
• 1715 Fleet: The Spanish treasure fleet that sank off the coast of Florida in 1715 has been a prolific source of gold escudos, silver reales, and other artifacts for decades. Coins from the 1715 Fleet remain popular with collectors and are widely available through reputable dealers.

What Collectors Should Know Before Buying

If you’re considering adding shipwreck or hoard coins to your collection, here are my essential recommendations:

1. Buy certified: Always purchase shipwreck coins that have been authenticated and graded by PCGS, NGC, or another reputable third-party grading service. The provenance designation on the holder is critical for both value and resale.
2. Understand the premium: Shipwreck and hoard coins command premiums over non-provenance examples. Research recent auction results to understand the premium for specific dates, mints, and grades before you buy.
3. Factor in all costs: If you’re buying in a state with sales tax on coins — like Washington at 10.1% or California at up to 11.25% (though California exempts bullion and coin purchases over $2,000) — make sure you calculate the total cost including tax, shipping, and any buyer’s premium. As one forum member noted, the combined cost of buyer’s premium plus sales tax can exceed 36% over hammer price at major auction houses.
4. Consider tax-free alternatives: States like Oregon (0% sales tax), New Hampshire (no sales tax), and Delaware (no sales tax) are popular destinations for coin buyers. Many reputable dealers are located in these states, and online purchases shipped to tax-free states can save you a significant amount.
5. Document everything: Keep all receipts, certificates, and provenance documentation. If you ever sell the coin, this documentation will be essential for maximizing your return.

The Broader Market: Taxes, Premiums, and the Future of Hoard Collecting

The forum discussion that inspired this article centered on the impact of state sales taxes on coin collecting. And it’s a legitimate concern. When you combine high state sales taxes with auction house buyer’s premiums, shipping costs, and the inherent premiums on shipwreck and hoard coins, the total cost of acquiring significant pieces can be daunting.

But here’s the perspective I’ve gained from decades in this field: the best coins always find their level. Shipwreck coins from the S.S. Central America, authenticated Redfield Hoard silver dollars, and Saddle Ridge Hoard gold coins have consistently appreciated in value because their supply is fixed and their stories are irreplaceable. No new S.S. Central America will ever be discovered. No new Redfield Hoard will ever surface. These are finite resources with infinite stories.

Consider the following market realities:

• Shipwreck coins are a hedge against market volatility: Because their value is driven by historical significance and collector demand rather than purely by metal content, shipwreck coins tend to hold their value better during market downturns.
• Hoard coins offer entry points for new collectors: Not every Redfield Hoard Morgan dollar costs a fortune. Common-date examples in lower grades can be acquired for modest premiums over non-hoard coins, giving new collectors an affordable way to own a piece of numismatic history.
• The legal landscape is evolving: As forum members noted, there is already discussion in Washington State about repealing the sales tax on coins and bullion. The 2018 Supreme Court decision in South Dakota v. Wayfair, Inc. opened the door for states to collect sales tax on remote purchases, but it also sparked a backlash that may lead to exemptions for collectible coins and bullion in some jurisdictions.

Conclusion: Why Shipwreck and Hoard Coins Deserve a Place in Every Serious Collection

The coins recovered from the S.S. Central America, the Redfield Hoard, the Saddle Ridge Hoard, and countless other shipwrecks and buried treasures represent some of the most fascinating and valuable pieces in all of numismatics. They survived hurricanes, shipwrecks, decades of burial, and the passage of centuries to reach our hands today. Each one carries a story that no freshly minted bullion coin or modern commemorative can match.

Yes, the cost of acquiring these coins has increased. Sales taxes, buyer’s premiums, and market premiums all add up. But the historical significance, the fixed supply, and the enduring collector demand for shipwreck and hoard coins make them among the soundest investments in the numismatic world.

My advice to collectors is straightforward: educate yourself on the specific characteristics of shipwreck and hoard coins, buy certified examples from reputable dealers, factor in all costs before making a purchase, and never lose sight of the fact that you’re not just buying a coin — you’re acquiring a piece of history that spent centuries waiting to be found.

The treasure is out there. It always has been. And for those of us who understand its value — both numismatic and historical — the hunt is half the fun.

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