Very similar to the standard seat backrest rake adjusting knob on my GT Junior, although I can't be absolutely certain because I've never had one off the seat !
The appearance/style is like a window handle on a 1600 Super or GTV, but the splines and size are not right for that. Early Alfetta vent window knob?
Andrew
It appears to me some sort of vent window knob. Note the slot visable for a "hairpin" wire keeper, assuming the mirror side slot is hidden from view. Don't think its Alfetta, if remembering correctly, Alfetta was screw attached
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