Did you see this information on Wexler's site:
http://doubleddie.com/1141429.html
On the listing numbers, did you see the WWHDO? That means there was an issue with the Die that year:
So it might be on of the three examples listed on the site. There are doubled dies that year. You just have to scroll downwards to see them. Some of the WWHO numbers have hub doubling along with the other issue.
http://doubleddie.com/1141429.html
Quote:
1966 50¢ WWHO-002
Description: Strong doubling shows on back of the neck and head as well as on the lower profile including the neck, chin, and lips. Doubling also shows on the back of the ear, the hair details to the right of the upper ear, and the designer's initials. A close spread shows on IGWT.
Die Markers: Obverse: The markers will vary on the different working dies. Reverse: The markers will vary on the different working dies.
Comments: The quickest way to spot the difference between WWHO-001 and WWHO-002 is the hair details just to the right of the upper ear. On WWHO-001 these hair details show barely any doubling, but on WWHO-002 the doubling of these hair details is strong.
1966 50¢ WWHO-002
Description: Strong doubling shows on back of the neck and head as well as on the lower profile including the neck, chin, and lips. Doubling also shows on the back of the ear, the hair details to the right of the upper ear, and the designer's initials. A close spread shows on IGWT.
Die Markers: Obverse: The markers will vary on the different working dies. Reverse: The markers will vary on the different working dies.
Comments: The quickest way to spot the difference between WWHO-001 and WWHO-002 is the hair details just to the right of the upper ear. On WWHO-001 these hair details show barely any doubling, but on WWHO-002 the doubling of these hair details is strong.
On the listing numbers, did you see the WWHDO? That means there was an issue with the Die that year:
Quote:
Significant changes have been made to the 1966 Kennedy half dollar obverse doubled die listings due to the discovery of three different obverse doubled working hubs.
The reassignment of numerous 1966 Kennedy half dollar obverse doubled die listings as being from the obverse doubled working hubs left huge "holes" in the obverse doubled die listings for this date. As an example, there were once 37 listings for the 1966 obverse doubled dies. Now there are just 12 working dies and the three working hubs. Many listings were assigned new numbers in order to fill the gaping holes in the listings. Notations of these changes are made for each of the affected varieties.
Significant changes have been made to the 1966 Kennedy half dollar obverse doubled die listings due to the discovery of three different obverse doubled working hubs.
The reassignment of numerous 1966 Kennedy half dollar obverse doubled die listings as being from the obverse doubled working hubs left huge "holes" in the obverse doubled die listings for this date. As an example, there were once 37 listings for the 1966 obverse doubled dies. Now there are just 12 working dies and the three working hubs. Many listings were assigned new numbers in order to fill the gaping holes in the listings. Notations of these changes are made for each of the affected varieties.
So it might be on of the three examples listed on the site. There are doubled dies that year. You just have to scroll downwards to see them. Some of the WWHO numbers have hub doubling along with the other issue.

























