There are five different styles of shift knobs over the years.
Early Ivory Style
Light Two-Tone Style
Late-1962 thru early-1965
Dark Two-Tone Style
mid-1965 thru 1966
Solid Black Domed Style
1966-69 manual shift
Standard Beetle Style
1968-69 automatic shift
There is still some confusion/uncertainty about when the light two-tone ends & the dark two-tone begins. It would
seem to make sense that the change would have happened at the same time as the heater control cover plate turned from light
gray to dark gray, thought to have been in mid-1965. If anyone has confirmation, please email Lee.
And it appears that some 1966 T34s were fitted with the dark two-tone & some had solid black.