1973-S Kennedy Half
Struck on Clad Proof Ike Dollar Planchet

NGC PF 68⭑


This proof Kennedy Half major mint error is unique in many ways and has no equals. It is the only known proof Kennedy Half struck on an oversized clad planchet (a proof Eisenhower Dollar planchet weighing 22.4 grams).

This deliberately struck unique and exotic Kennedy Half mint error is in gem condition with amazing eye appeal. It is pedigreed to John Devine "Lonesome John," a famous pioneer in the field of mint errors and was just certified by NGC. It was previously unknown to the numismatic community and is just now being offered for sale.

Although the obverse looks like a die cap, it is cupped, and was encapsulated in a double thickness NGC holder to accommodate the shape.





Intentional Errors

One of the most controversial categories of U.S. coins are mint errors. Many dealers and collectors, as well as coin auction houses, buy, sell, trade and auction many rare, exotic and unique major mint errors. Obviously, some of these defy logic and were intentionally created and taken out of the Mint.

In the early 2000's, a group of several hundred U.S. error coins were found in a safe-deposit box. Fred Weinberg purchased this group which included coins struck for proof sets and also coins struck for circulation. This group was auctioned by the California State Controller's Office of Unclaimed Property. The U.S. Secret Service inspected and released this collection to the State of California determining that it was legal to own. The State of California then auctioned the collection and the rest is history.

Another example of U.S. error coins escaping the Mint occurred in the 1970's. A hoard of proof error coins were smuggled out of the San Francisco Mint inside the oil pans of forklifts that were being serviced outside of the Mint. This topic was discussed in the June 6, 2022 Issue of Coin World, which covered Fred Weinberg's account of this story. The Coin World Managing Editor concluded:
Obviously, the marketplace accepts these coins, and some collectors are happy paying thousands of dollars for coins that show every indication of having been created through illegal means.

In Episode 11 of the PCGS video series Slab Lab, Seth Chandler interviews Fred Weinberg. In part 2 of the interview, Fred explains in detail why mint errors that are decades old are not recovered by the U.S. Mint. Fred's recollection of conversations in his office with the Chief of the U.S. Mint Police are extremely insightful and explain why the Mint doesn't attempt to recover error coins from decades ago.

Proof Errors are featured in my NLG Award winning book, World's Greatest Mint Errors.