1973-S Proof Kennedy Half Dollar
Double Struck
Second Strike Off-Center Flipover

NGC PF 65 Cameo


Although there are a few known double struck proof Kennedy Half Dollars, this is one of the finest known and one of the most spectacular U.S. proof mint errors ever discovered. It is hard to imagine a proof double struck U.S. coin that is more dramatic and that has this level of eye appeal and rarity. This is an off-center flipover double struck where each side shows the obverse and reverse.

Proof coins are struck by technicians who hand feed the blanks into special presses. They are produced, examined and packaged using extreme quality control. It is very unusual to find major proof errors. A few broadstrikes, off-centers, double strikes (in collar) and off-metals have been known to be found in sealed proof sets. Proof errors are aggressively sought after by many error collectors.

A very small group of Proof errors recently came from a collection that was auctioned by the State of California. 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 it has been dispersed since the sale.



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