It sure looks like a Koni. They were the only ones to my knowledge who used the push-pull film advance. It's the slightly oblong thing sticking out the side. From what I remember, the inside gears are supposed to be soft brass to prevent jamming... but they would wear out prematurely and would strip easily if you wind too fast...
Now as to which model it is precisely, I'd have to do a bit of research on it.
