This 1964 Kennedy Half Dollar was struck on a clad Quarter planchet instead of a silver Half Dollar planchet. The U.S. Mint transitioned from 90% silver coinage in 1964 to clad coinage in 1965.

Nicely centered showing Kennedy's portrait and enough of the date to determine that it was dated 1964. The prongs of the NGC holder at 4:00 on the obverse partially hides the 4 of 1964.

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