Hi Kilian,
the float mounting and strut-arrangement is definitely Friedrichshafen.
So are your guessess: FF 33 or FF 49!
I thought first: three-bay - FF 49!
But if not misscaptioned I´ve seen pics of a "
FF 33h" and "
FF 33j" that looks same. Although they have the high rim of the engine side panel.
(You´ve probably known that before

)
It might be just by the angle of view, but it may be possible that the wing cut-out of a FF 49 is bigger than in your pic. Only I wouldn´t give much to this guess.
I think you won´t continue guessing here. And I´m interested too, what are the differences to note or if somebody knows what are the two- & three-bay FF 33`s.
Cheers
Aquilius