Proof (1965-70) 40% Silver Kennedy Half Dollar
On Detached Scrap Layer
Elliptical Strike Clip with Brockage Reverse

1 of 2 Known


This is a 40% silver Kennedy Half Dollar struck on an elliptical strike clip with a brockage reverse. It is also considered struck scrap but it is actually an elliptical strike clip.

In 1975 (as shown below), in my mint error catalog I offered a proof Kennedy Half Dollar mated set of two coins struck together. The elliptical strike clip was sheared off from the planchet creating three pieces to this mated set.


From 1974 - 1978 I mailed out over 25 price lists of major mint errors. My all time favorite was my first catalog which was photographed, printed and distributed in 1975 by John Devine (Lonesome John) from Newbury Park, CA. It was a 26 page catalog containing the finest major mint errors with photographs, descriptions and prices.




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 chapter 21 of my
NLG Award winning book, World's Greatest Mint Errors: