you mean you figured out why they put two dials on the ZZ ? This one is adressmarker , but maybe a little older...
large ZZ dail is on the right...only thing I see that the small dail does is maybe a stop or ock for the larger dail, The larger one does control zz width. if the small is set on #3 you can only move the big one to # 3 so on ...
Now the little red light on the hood, Thats classy LOL , 1950's fiber optic's