Any ideas Volker on the fact which number of the other series (41-42-43-45) stood for what kind of plane ?
Some tough nuts in that one, but here we go:
41: Friedrichshafen FF11 - Proven, and BTW the boat or fuselage was build by Oertz as well for this a/c
42 - claimed to be a Lohner (most probably "L" I guess - I donīt know any source to really prove that)
43 - claimed to be a Curtisss "F" - again no certain proof available to me
44 - The Bat Boat II, proven
45 - Unnamed AEG Flying Boat (unless one accepts "FB" as a designation), high wing (ie, parasol) aircraft which crashed during early trials.
46 - The Oertz FB 3 discussed above
Personally, Iīd be most interested in that elusive German Curtiss F boat, if it really existed...