The more I look at yours,the more confused I get.
All 3 of mine (Huey,Dewey and Louie) had the choke coils on the throtle base shaft,not on the carb body like yours.
It looks like its missing something on the throtle side.Maybe a governor?
I gotta guess its some kind of Industrial carb...like off a forklift or a truck or a tractor.