As near as I can understand it, the conventional wisdom is that there are only two versions of the choke knob for the 240Z:  an early, rounded version and a later, more square-ish version (the knob in the 260Z had a more slender design than either of the 240's, and I guess the fuel-injected 280Z didn't have a choke knob at all).  In all of the many pictures that I've seen of the 240 choke knob, never does the design include the script, 'CHOKE' in addition to the icon. My small assortment of