Science Meets 1776: New Whitman Book Reopens the Mystery of the Continental Dollar

Key Facts

• 250-year mystery: The 1776 Continental Dollar remains one of America’s most debated numismatic artifacts—coin or medal, where was it made, and why?
• Cutting-edge science: Researchers used advanced synchrotron X-ray micro-diffraction technology at Argonne National Laboratory to examine all four known silver examples, involving approximately $7 million in rare coins and material.
• Groundbreaking evidence: After 437 hours of scanning, researchers recovered previously unseen evidence of the coins’ underlying host planchets.
• Reverse-engineered history: The team struck 112 experimental pieces in four metals to investigate how the originals could have been made.
• Science meets 1776: Published for America’s 250th anniversary, The Continental Dollar: A Journey of Discovery brings 21st-century technology to a mystery dating to the nation’s founding.

Was the legendary 1776 Continental Dollar one of America’s first coins—or was it a medal produced elsewhere? Who made it, where was it struck, and what purpose did it serve?

For 250 years, those questions have surrounded one of the most mysterious artifacts associated with America’s founding. Now, as the nation celebrates its 250th anniversary, acclaimed researcher and collector Robert L. Rodriguez reopens the case in The Continental Dollar: A Journey of Discovery, a groundbreaking new book from Whitman Brands.

Dated 1776 and bearing imagery closely associated with Continental Currency and Benjamin Franklin, the Continental Dollar has long occupied a tantalizing place in American numismatics. No known surviving records of the Continental Congress document its creation, leaving generations of collectors and researchers to debate its origin, manufacture, and even whether it should properly be considered a coin.

Rodriguez set out to approach the mystery differently: follow the physical evidence.

“The Continental Dollar has been an enigma hidden for 250 years,” Rodriguez writes. “Spirited debates over the purpose, location, method, and timeframe of their mintage continue to this day.”

The resulting Continental Dollar Project became what Rodriguez describes as the most extensive investigation ever undertaken into these pieces. The multidisciplinary effort brought together experts in numismatics, physics, metallurgy, minting, and statistics and required access to approximately $7 million in rare coins and related material.

At the heart of the investigation was cutting-edge research conducted at Argonne National Laboratory’s Advanced Photon Source synchrotron. Using X-ray micro-diffraction technology capable of examining what lies beneath a coin’s surface, Rodriguez and the scientific team studied all four known silver Continental Dollars. After 437 hours of scanning, the researchers recovered evidence of the host planchets beneath the coins’ visible designs—information unavailable through conventional examination.

“If these truths were discernible on the surface of the Continental Dollars, the question of their origin would have been settled long ago,” Rodriguez writes, quoting numismatic researcher Joel J. Orosz. “These truths lie beneath the dollars’ surfaces.”

But Rodriguez did not stop with laboratory analysis. The investigation expanded into statistical modeling, historical and observational research, and an ambitious reverse-engineering experiment. Working with minting expert Dan Carr at the Moonlight Mint, the team produced 112 experimental Continental Dollars in four different metals under varying striking conditions to better understand how the originals could have been manufactured.

The result is a body of new evidence that Rodriguez believes warrants a fundamental reassessment of the Continental Dollar and its place in early American monetary history.

“Our conclusions are predicated on science, statistical and observational analysis, and reverse engineering,” Rodriguez writes. “It is my hope that this book will further illuminate these legendary artifacts for the numismatic community.”

In his foreword, numismatic author and researcher Leonard Augsburger describes Rodriguez as bringing “fresh eyes” to a longstanding numismatic controversy and praises his willingness to go beyond the traditional written record in search of physical evidence.

The timing gives the investigation special resonance. The Continental Dollar bears the defining date 1776, while its interconnected rings and Revolutionary-era motifs evoke the emerging nation and its struggle for independence. Two and a half centuries later, modern scientific tools are allowing researchers to ask new questions of an artifact created at the very moment the United States was born.

Richly illustrated with detailed coin photography, scientific imagery, charts, archival material, and the evidence assembled during the investigation, The Continental Dollar: A Journey of Discovery gives readers a front-row seat to the research and the discoveries that followed.

Part detective story, part scientific investigation, and part numismatic history, The Continental Dollar: A Journey of Discovery reopens a 250-year-old case and offers a bold new perspective on one of America’s most fascinating—and enduring—mysteries.

Published by Whitman®, the most trusted name in numismatic literature, The Continental Dollar: A Journey of Discovery is available now from Whitman.com, Amazon, Ebay, bookstores, distributors, and other retailers nationwide.

For more information about upcoming releases, as well as numismatic folders, albums, and supplies, visit whitman.com.

About the Author

Robert L. Rodriguez is an investor, author, and accomplished numismatist whose collecting interests span early American coinage, colonial issues, ancient coins, and medals. Following a distinguished career in investment management, he served as Chief Executive Officer of First Pacific Advisors (FPA), helping grow the firm into one of the nation's leading independent investment management companies. Rodriguez is a Fellow and Trustee of the American Numismatic Society, where he endowed the Resolute Americana Chair of American Numismatics in 2022 to support research across the numismatic history of the Americas. He is also a member of the American Numismatic Association, Colonial Coin Collectors Club, Early American Coppers, Medal Collectors of America, U.S. Mexican Numismatic Association, and several other leading numismatic organizations. His Resolute Americana Collection includes the finest collections of Continental Dollars ever assembled, reflecting a lifelong passion for America's earliest coinage. A dedicated advocate for numismatic education, Rodriguez regularly shares his collection to promote a deeper appreciation of American history and the nation's numismatic heritage.