Houston we have a problem.
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.
So a lot of these are/where listed at one time. But issue with the doubled working hubs created a lot of doubled dies. So you have to check to see if you have an example of the listed ones below the three. If you match a one with two 'WW' (yes two W's) on the number, those are the problem ones.