Spotting the S vs. O: Your Guide to Mint Mark Mastery in Roll Hunting

Introduction: The Thrill of the Hunt

You don’t always need a dealer to find treasure. Sometimes, the best finds are hiding in plain sight—in your pocket change, at a local estate sale, or buried in a bulk lot from an auction. Roll hunting and cherry picking are time-honored traditions in numismatics, offering both excitement and the potential for profit. One of the most common challenges for collectors is distinguishing between similar mint marks, especially when dealing with worn or poorly photographed coins. Today, we’re diving into the world of mint mark identification, using a real-world example to sharpen your skills and boost your confidence at the next coin show or bulk purchase.

The S vs. O Conundrum: A Case Study

Recently, a lively discussion erupted on a popular coin forum about a particular coin listed on eBay. The question at hand: was the mint mark an ‘S’ (San Francisco) or an ‘O’ (New Orleans)? This might seem like a minor detail, but for collectors, the difference can mean significant value—especially for certain dates and varieties.

“Can’t tell if that is a mint mark from the photo. It can’t be a D. If you can’t tell, just pass.”

This cautious approach is wise. When examining coins, especially in photos or worn condition, clarity is crucial. If you’re unsure, it’s often best to move on—there will always be more opportunities.

Why Mint Marks Matter

Mint marks are small letters on coins indicating where they were produced. For U.S. coins, common mint marks include ‘P’ (Philadelphia), ‘D’ (Denver), ‘S’ (San Francisco), and ‘O’ (New Orleans, used until 1909). Certain mint marks are rarer than others, making coins more desirable to collectors. For example, San Francisco mint coins are often prized for their quality and limited mintage.

Identifying Key Markers: Tips for Roll Hunters

1. Know Your Coin’s Anatomy

Before you can spot a mint mark, you need to know where to look. For most U.S. coins, the mint mark is located near the date. On Morgan and Peace dollars, it’s found below the wreath on the reverse. On Lincoln cents, it’s below the date on the obverse. Familiarize yourself with the specific location for the coin series you’re hunting.

2. Compare Shapes and Sizes

Even when worn, mint marks have distinctive shapes. An ‘S’ is typically more curved and blocky, while an ‘O’ is a perfect circle. In the case of our eBay coin, experienced collectors quickly identified the mark as an ‘S’ based on its shape and placement.

“100% an S. Small block S is the correct mintmark shape and it’s in the correct position.”

3. Use Multiple Light Sources

When examining coins in person, use a good lamp or flashlight to highlight details. Tilt the coin to catch reflections—this can make faint or worn mint marks more visible.

4. Magnification is Your Friend

A simple magnifying glass or jeweler’s loupe can reveal details invisible to the naked eye. This is especially helpful when dealing with circulated or cleaned coins.

Where to Find Hidden Gems

Circulation Finds

Never underestimate pocket change. While rare finds are less common today, valuable varieties and mint errors still turn up. Make a habit of checking your change, especially for older coins or those with unusual features.

Bulk Lots and Bank Rolls

Buying rolls of coins from banks or bulk lots at auctions can be a goldmine. You’ll often find a mix of common and scarce dates, and occasionally, a true rarity. Always inspect each coin carefully, and don’t be afraid to pass on lots that are overpriced or lack clear photos.

Estate Sales and Garage Sales

Older collections often surface at estate sales, garage sales, or flea markets. These can be excellent places to find overlooked varieties or coins with valuable mint marks. Bring your knowledge and a magnifying glass—you never know what you might discover.

Common Pitfalls and How to Avoid Them

Misleading Photos

Online listings, especially on eBay, can be deceptive. Photos may be blurry, poorly lit, or taken at an angle that obscures important details. If you can’t clearly see the mint mark, it’s best to pass or ask the seller for better pictures.

“I hate threads about ebay coins that don’t include photos. Links to ebay listings only last several weeks after the auction ends.”

Overpaying for Common Coins

Just because a coin has a mint mark doesn’t mean it’s valuable. Research current market values and be wary of sellers who overinflate prices based on minor varieties or condition issues.

Relying on Seller Feedback Alone

While seller reputation matters, it’s not the only factor. Even reputable sellers can make mistakes or misrepresent coins. Always do your own due diligence.

Real-World Example: The eBay Coin

Let’s revisit the eBay coin that sparked our discussion. The coin in question was a Morgan dollar with a mint mark that some thought might be an ‘O’. After careful examination and input from several experienced collectors, the consensus was clear: it was an ‘S’.

“Ill go with s as well. The sellers feedback stinks so pass.”

This highlights an important lesson: even if you correctly identify a valuable variety, always consider the seller’s reputation and the overall value of the coin. In this case, the coin sold for $202.50—a fair price for a circulated Morgan dollar, but not a windfall for the buyer.

Building Your Expertise

Study Reference Books

Invest in a good coin guide, such as the “Red Book” (A Guide Book of United States Coins). These resources provide detailed information on mint marks, varieties, and values.

Join Online Communities

Forums, Facebook groups, and Reddit communities are great places to ask questions, share finds, and learn from experienced collectors. Don’t be afraid to post photos and ask for opinions.

Attend Coin Shows and Club Meetings

Nothing beats hands-on experience. Coin shows and local clubs offer opportunities to handle coins, meet dealers, and learn from experts.

Conclusion: The Joy of Discovery

Roll hunting and cherry picking are more than just ways to find valuable coins—they’re a journey of discovery and learning. By honing your skills in mint mark identification, you’ll not only increase your chances of finding hidden treasures but also deepen your appreciation for the rich history and artistry of numismatics. Remember, patience and persistence are key. Every roll, bulk lot, or estate sale is a new opportunity to uncover something special. Happy hunting!