The 1964 Kennedy Half Dollar Proof with heavily accented hair is believed to be the original design used for striking the early coins. Later in the year, with the help of Jacqueline Kennedy, the design was modified to make the hair above the ear less prominent. This variety is somewhat scarce with less than 5% of the 1964 mintage believed to have the accented hair. 

1964 Kennedy Half Dollar Heavily Accented Hair NGC PF67

SKU: 40899060