Stig,
There are a few Bavrian LVG B.I with the number on a white rectangle, especially LVG B.I (Ot) aircraft and a simialar marking on the fuselage at least on a Pfalz in Jack herris volume on Pfalz aircraft, so I wonder if the serial on a white rectangle was the standard form og marking for Bavarian aircraft before joining the Idflieg system.It would be nice to have a list of Bavarian aircraft serials in order to track down other machines to see if the same styling appears elsewhere.As you're in Munich....
I wonder if such a list has already been published somewhere, Bavarian related documentation appears to have survived somewhat better than its Reich equivalent.
Regards,
Clint