Version #4 – 1967-69
Nylint advertising makes it clear that the rear winch was dropped for the 1967 production year. The colororange continued as did most other details. The lone exception was the black "N" decal.
Version #5 – 1970-72
Version #5 was painted yellow and carried the red "N" decal. It also introduced a new tread design with much less aggressive track cleats. As light color change in the plastic wheels is also noted.
Version #4 on the left has a much higher cleat than Version #5 on the right.
The underside of the Version #5 tread remained the same as Version #4.