In 1914 there were the (unnamed?) Flugboot and the Z5 floatplane.
Please give me some time to find more details of these two planes (sorry, but very busy for the moment).
Whay about the designation F I?
Just as richard B in his posting of November 24, 1917, I only found reference to two 1914 A.E.G. seaplanes: the Z 5 floatplane and the Flugboot.
Both were designed for the 1914 Ostseeflug-Wettbewerb, and to be flown by Bruno Gruner (the Z 5) and Theodor Schauenburg (the Flugboot). The race was cancelled due to the mobilisation, and both planes were tested by the navy. The Flugboot crashed during tests.
My dear hesham, what are the sources of an other 1914 flying boat?
And for the designation F1, F for Flugboot seems logical, but apart from Kroschel, Die deutschen Militärflugzeuge 1910-1918 (1994), I can't find any reference to this designation. Are there other sources?