Originally Posted by Dave_Kent
Well, to me it looks like an Italian semi-rigid, maybe a Forlanini. Itís not the F 6, as the upper vertical fin is the wrong shape. As Iíve only seen photos of the F 6, Iíll have to guess that itís the F 5, which did have 12 gas cells. It was produced in 1917.
This is the Forlanini F.5
which IMO does not comply with the Challenge picture.