Hi;
From the book :
ATLAS NORD - Terrains d'aviation militaires. Première Guerre Mondiale.
At Famars - wrote as a caption under some photos we have had
Jastaschule 1 ('11/1916 and 10/18), FAA 26, FAA 263, FAA 21, FAA 273
Here is a postcard (Delcampe) of the same castle readable on a photo of this album :
Attachment 18725
Bertrand