If it is 723, I got my info from the "Gotha!" Datafile special, page 58, photo 87, which indicates the date of July 5 1918, downed in France. The photo was inverted to show the dragon and you can see the fuselage was upside down in the crash, like this one. There are also other references to this aircraft in the Datafile.
But, if it is another G.V, I am out of stories at the moment.......
Anyone wishing to host the next challenge may rise to the occasion, as I am still very computer ignorant on doing this (but I will one day!)