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In the world of coin collecting, it’s often not the age of a coin that captivates enthusiasts, but the unusual errors that escape the minting process. One such coin that recently grabbed headlines is a 2011 Sacagawea Dollar with a rare reverse rotation error. This extraordinary misalignment led to an intense bidding war, ultimately selling for a staggering $2.2 million at auction.
Origins of the Sacagawea Dollar
The Sacagawea Dollar was first introduced in 2000 to honor Sacagawea, the Shoshone woman who played a pivotal role in the Lewis and Clark expedition. The coin’s obverse features Sacagawea carrying her infant son, Jean Baptiste, while the reverse showcases a soaring eagle, designed by Thomas D. Rogers. Millions of Sacagawea Dollars were minted in Philadelphia in 2011, but a very small subset of these coins contains a significant error: the reverse eagle design is rotated 180 degrees, creating a complete upside-down effect.
The Reverse Rotation Error
Such a misalignment, known in numismatic circles as a reverse rotation error, is extremely rare. Experts estimate that fewer than a dozen 2011 Sacagawea Dollars with this error are known to exist. The coin that fetched $2.2 million was in mint state condition, graded MS-68, and was completely untouched since leaving the mint. Its pristine state, combined with the dramatic nature of the error, made it one of the most sought-after modern U.S. coins.
Normally, when a Sacagawea Dollar is flipped, the reverse side aligns upright with the obverse. In this unique 2011 example, however, the eagle on the reverse was perfectly inverted. Such errors occur during the minting process when the reverse die is not properly aligned with the obverse die. Mistakes of this magnitude are exceedingly difficult to replicate, making them extremely valuable to collectors.
Historical and Cultural Significance
The coin’s historical and cultural significance added to the intrigue. Sacagawea, a young Lemhi Shoshone woman, guided the Lewis and Clark expedition across the western territories of the United States. Her depiction on the coin makes this misprint not only a collector’s gem but also a tribute to an iconic figure in American history. Collectors and numismatists were quick to recognize the coin’s rarity and significance, sparking intense interest.
Why This Coin Stands Out
While reverse rotation errors have appeared on U.S. coins before, this particular 2011 Sacagawea Dollar stood out for several reasons. First, it appeared on a relatively new commemorative coin already valued for its historical context. Second, the rotation error was complete—a full 180 degrees—making it one of the most dramatic examples of this type of minting fault. Third, the coin was in near-perfect condition, verified by reputable grading institutions.
The auction of this coin in August 2025 set a new benchmark for modern U.S. coin collecting. While minor rotation errors on Sacagawea Dollars can range from a few hundred to tens of thousands of dollars, this extreme upside-down error secured the $2.2 million sale, cementing its status as a modern numismatic marvel.
How to Spot the Error
For collectors interested in spotting such an error, the process is straightforward: take a 2011 Sacagawea Dollar from the Philadelphia Mint, turn it vertically, and check if the eagle on the reverse is inverted relative to Sacagawea’s image. Experts advise against cleaning the coin, as this can diminish its value. Instead, it should be authenticated by professional grading services such as PCGS or NGC.
If you happen to find one of these rare coins, handle it carefully, ideally with gloves, store it in a protective holder, and consult a professional for verification. Auctioning it through a reputable house like Heritage Auctions or Stack’s Bowers ensures the best chance of a record-breaking sale.
Sacagawea Dollar Specifications
| Feature | Details |
|---|---|
| Coin Name | Sacagawea Dollar |
| Obverse Designer | Glenna Goodacre |
| Reverse Designer | Thomas D. Rogers |
| Value | $1 |
| Mass | 8.100 g |
| Diameter | 26.49 mm (1.043 in) |
| Edge | Plain (2000–2008), Lettered (2009–Present) |
| Composition | 88.5% Copper, 6% Zinc, 3.5% Manganese, 2% Nickel |
| Mint Marks | P (Philadelphia), D (Denver), S (San Francisco), W (West Point, special strikes) |
| Design Date | 2000 |
| Rare 2011 Error | Reverse eagle rotated 180° (upside-down) |
2011 Sacagawea Dollar Error Values
| Error Type | Condition | Estimated Value | Notable Sale |
|---|---|---|---|
| Normal | Circulated | $1–$3 | None |
| Normal | Uncirculated (MS65–MS67) | $10–$25 | None |
| Minor Rotation (15°–30°) | Uncirculated | $500–$2,500 | Private Sales |
| Moderate Rotation (45°–90°) | Uncirculated | $10,000–$50,000 | Small Auctions |
| Major Rotation (180° “Upside Down”) | Choice MS | $100,000–$750,000 | Private Collectors |
| Extreme Rotation (Unique Mint State) | MS-68 | $2,200,000 | Heritage Auctions |
Conclusion
The 2011 Sacagawea Dollar with a reverse rotation error is a prime example of how tiny minting mistakes can become monumental treasures in the numismatic world. Its $2.2 million auction price highlights the intersection of rarity, historical significance, and the excitement of coin collecting.
Disclaimer: This article is for informational purposes only and does not constitute investment advice. Coin values fluctuate based on rarity, demand, and condition. Consult certified numismatic professionals before making any purchase, sale, or investment decisions.